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From a1ec463c8207bde97b3575d12e396e999a55a8d0 Mon Sep 17 00:00:00 2001
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From: Patrick Monnerat <patrick@monnerat.net>
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Date: Tue, 7 Sep 2021 13:26:42 +0200
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Subject: [PATCH] ftp,imap,pop3,smtp: reject STARTTLS server response
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pipelining
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If a server pipelines future responses within the STARTTLS response, the
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former are preserved in the pingpong cache across TLS negotiation and
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used as responses to the encrypted commands.
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This fix detects pipelined STARTTLS responses and rejects them with an
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error.
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CVE-2021-22947
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Bug: https://curl.se/docs/CVE-2021-22947.html
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Upstream-commit: 8ef147c43646e91fdaad5d0e7b60351f842e5c68
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Signed-off-by: Kamil Dudka <kdudka@redhat.com>
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---
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lib/ftp.c | 3 +++
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lib/imap.c | 4 +++
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lib/pop3.c | 4 +++
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lib/smtp.c | 4 +++
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tests/data/Makefile.inc | 2 +-
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tests/data/test980 | 52 ++++++++++++++++++++++++++++++++++++
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tests/data/test981 | 59 +++++++++++++++++++++++++++++++++++++++++
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tests/data/test982 | 57 +++++++++++++++++++++++++++++++++++++++
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tests/data/test983 | 52 ++++++++++++++++++++++++++++++++++++
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9 files changed, 236 insertions(+), 1 deletion(-)
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create mode 100644 tests/data/test980
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create mode 100644 tests/data/test981
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create mode 100644 tests/data/test982
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create mode 100644 tests/data/test983
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diff --git a/lib/ftp.c b/lib/ftp.c
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index 71f998e..e920138 100644
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--- a/lib/ftp.c
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+++ b/lib/ftp.c
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@@ -2688,6 +2688,9 @@ static CURLcode ftp_statemach_act(struct connectdata *conn)
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case FTP_AUTH:
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/* we have gotten the response to a previous AUTH command */
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+ if(pp->cache_size)
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+ return CURLE_WEIRD_SERVER_REPLY; /* Forbid pipelining in response. */
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+
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/* RFC2228 (page 5) says:
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*
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* If the server is willing to accept the named security mechanism,
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diff --git a/lib/imap.c b/lib/imap.c
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index feb7445..09bc5d6 100644
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--- a/lib/imap.c
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+++ b/lib/imap.c
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@@ -939,6 +939,10 @@ static CURLcode imap_state_starttls_resp(struct connectdata *conn,
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(void)instate; /* no use for this yet */
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+ /* Pipelining in response is forbidden. */
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+ if(conn->proto.imapc.pp.cache_size)
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+ return CURLE_WEIRD_SERVER_REPLY;
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+
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if(imapcode != IMAP_RESP_OK) {
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if(data->set.use_ssl != CURLUSESSL_TRY) {
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failf(data, "STARTTLS denied");
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diff --git a/lib/pop3.c b/lib/pop3.c
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index 7698d1c..dccfced 100644
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--- a/lib/pop3.c
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+++ b/lib/pop3.c
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@@ -750,6 +750,10 @@ static CURLcode pop3_state_starttls_resp(struct connectdata *conn,
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(void)instate; /* no use for this yet */
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+ /* Pipelining in response is forbidden. */
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+ if(conn->proto.pop3c.pp.cache_size)
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+ return CURLE_WEIRD_SERVER_REPLY;
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+
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if(pop3code != '+') {
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if(data->set.use_ssl != CURLUSESSL_TRY) {
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failf(data, "STARTTLS denied");
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diff --git a/lib/smtp.c b/lib/smtp.c
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index 1defb25..1f89777 100644
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--- a/lib/smtp.c
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+++ b/lib/smtp.c
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@@ -685,6 +685,10 @@ static CURLcode smtp_state_starttls_resp(struct connectdata *conn,
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(void)instate; /* no use for this yet */
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+ /* Pipelining in response is forbidden. */
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+ if(conn->proto.smtpc.pp.cache_size)
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+ return CURLE_WEIRD_SERVER_REPLY;
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+
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if(smtpcode != 220) {
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if(data->set.use_ssl != CURLUSESSL_TRY) {
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failf(data, "STARTTLS denied, code %d", smtpcode);
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diff --git a/tests/data/Makefile.inc b/tests/data/Makefile.inc
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index 163ce59..42b0569 100644
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--- a/tests/data/Makefile.inc
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+++ b/tests/data/Makefile.inc
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@@ -108,7 +108,7 @@ test927 test928 test929 test930 test931 test932 test933 test934 test935 \
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test936 test937 test938 test939 test940 test941 test942 test943 test944 \
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test945 test946 test947 test948 test949 test950 test951 test952 \
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\
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-test984 test985 test986 \
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+test980 test981 test982 test983 test984 test985 test986 \
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\
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test1000 test1001 test1002 test1003 test1004 test1005 test1006 test1007 \
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test1008 test1009 test1010 test1011 test1012 test1013 test1014 test1015 \
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diff --git a/tests/data/test980 b/tests/data/test980
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new file mode 100644
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index 0000000..97567f8
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--- /dev/null
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+++ b/tests/data/test980
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@@ -0,0 +1,52 @@
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+<testcase>
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+<info>
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+<keywords>
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+SMTP
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+STARTTLS
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+</keywords>
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+</info>
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+
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+#
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+# Server-side
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+<reply>
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+<servercmd>
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+CAPA STARTTLS
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+AUTH PLAIN
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+REPLY STARTTLS 454 currently unavailable\r\n235 Authenticated\r\n250 2.1.0 Sender ok\r\n250 2.1.5 Recipient ok\r\n354 Enter mail\r\n250 2.0.0 Accepted
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+REPLY AUTH 535 5.7.8 Authentication credentials invalid
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+</servercmd>
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+</reply>
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+
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+#
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+# Client-side
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+<client>
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+<features>
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+SSL
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+</features>
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+<server>
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+smtp
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+</server>
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+ <name>
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+SMTP STARTTLS pipelined server response
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+ </name>
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+<stdin>
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+mail body
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+</stdin>
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+ <command>
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+smtp://%HOSTIP:%SMTPPORT/%TESTNUMBER --mail-rcpt recipient@example.com --mail-from sender@example.com -u user:secret --ssl --sasl-ir -T -
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+</command>
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+</client>
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+
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+#
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+# Verify data after the test has been "shot"
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+<verify>
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+# 8 is CURLE_WEIRD_SERVER_REPLY
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+<errorcode>
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+8
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+</errorcode>
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+<protocol>
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+EHLO %TESTNUMBER
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+STARTTLS
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+</protocol>
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+</verify>
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+</testcase>
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diff --git a/tests/data/test981 b/tests/data/test981
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new file mode 100644
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index 0000000..2b98ce4
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--- /dev/null
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+++ b/tests/data/test981
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@@ -0,0 +1,59 @@
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+<testcase>
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+<info>
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+<keywords>
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+IMAP
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+STARTTLS
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+</keywords>
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+</info>
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+
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+#
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+# Server-side
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+<reply>
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+<servercmd>
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+CAPA STARTTLS
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+REPLY STARTTLS A002 BAD currently unavailable\r\nA003 OK Authenticated\r\nA004 OK Accepted
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+REPLY LOGIN A003 BAD Authentication credentials invalid
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+</servercmd>
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+</reply>
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+
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+#
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+# Client-side
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+<client>
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+<features>
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+SSL
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+</features>
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+<server>
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+imap
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+</server>
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+ <name>
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+IMAP STARTTLS pipelined server response
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+ </name>
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+ <command>
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+imap://%HOSTIP:%IMAPPORT/%TESTNUMBER -T log/upload%TESTNUMBER -u user:secret --ssl
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+</command>
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+<file name="log/upload%TESTNUMBER">
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+Date: Mon, 7 Feb 1994 21:52:25 -0800 (PST)
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+From: Fred Foobar <foobar@example.COM>
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+Subject: afternoon meeting
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+To: joe@example.com
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+Message-Id: <B27397-0100000@example.COM>
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+MIME-Version: 1.0
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+Content-Type: TEXT/PLAIN; CHARSET=US-ASCII
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+
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+Hello Joe, do you think we can meet at 3:30 tomorrow?
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+</file>
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+</client>
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+
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+#
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+# Verify data after the test has been "shot"
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+<verify>
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+# 8 is CURLE_WEIRD_SERVER_REPLY
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+<errorcode>
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+8
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+</errorcode>
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+<protocol>
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+A001 CAPABILITY
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+A002 STARTTLS
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+</protocol>
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+</verify>
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+</testcase>
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diff --git a/tests/data/test982 b/tests/data/test982
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new file mode 100644
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index 0000000..9e07cc0
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--- /dev/null
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+++ b/tests/data/test982
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@@ -0,0 +1,57 @@
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+<testcase>
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+<info>
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+<keywords>
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+POP3
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+STARTTLS
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+</keywords>
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+</info>
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+
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+#
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+# Server-side
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+<reply>
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+<servercmd>
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+CAPA STLS USER
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+REPLY STLS -ERR currently unavailable\r\n+OK user accepted\r\n+OK authenticated
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+REPLY PASS -ERR Authentication credentials invalid
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+</servercmd>
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+<data nocheck="yes">
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+From: me@somewhere
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+To: fake@nowhere
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+
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+body
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+
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+--
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+ yours sincerely
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+</data>
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+</reply>
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+
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+#
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+# Client-side
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+<client>
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+<features>
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+SSL
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+</features>
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+<server>
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+pop3
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+</server>
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+ <name>
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+POP3 STARTTLS pipelined server response
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+ </name>
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+ <command>
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+pop3://%HOSTIP:%POP3PORT/%TESTNUMBER -u user:secret --ssl
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+ </command>
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+</client>
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+
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+#
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+# Verify data after the test has been "shot"
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+<verify>
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+# 8 is CURLE_WEIRD_SERVER_REPLY
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+<errorcode>
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+8
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+</errorcode>
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+<protocol>
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+CAPA
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+STLS
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+</protocol>
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+</verify>
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+</testcase>
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diff --git a/tests/data/test983 b/tests/data/test983
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new file mode 100644
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327345 |
index 0000000..300ec45
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--- /dev/null
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+++ b/tests/data/test983
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@@ -0,0 +1,52 @@
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+<testcase>
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+<info>
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+<keywords>
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+FTP
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+STARTTLS
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+</keywords>
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+</info>
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+
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+#
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+# Server-side
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+<reply>
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+<servercmd>
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+REPLY AUTH 500 unknown command\r\n500 unknown command\r\n331 give password\r\n230 Authenticated\r\n257 "/"\r\n200 OK\r\n200 OK\r\n200 OK\r\n226 Transfer complete
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+REPLY PASS 530 Login incorrect
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+</servercmd>
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+</reply>
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+
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+# Client-side
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327345 |
+<client>
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+<features>
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+SSL
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+</features>
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+<server>
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+ftp
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+</server>
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+ <name>
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+FTP STARTTLS pipelined server response
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+ </name>
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+<file name="log/test%TESTNUMBER.txt">
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+data
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+ to
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+ see
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+that FTPS
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+works
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+ so does it?
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+</file>
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+ <command>
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+--ssl --ftp-ssl-control ftp://%HOSTIP:%FTPPORT/%TESTNUMBER -T log/test%TESTNUMBER.txt -u user:secret -P %CLIENTIP
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+</command>
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+</client>
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+
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+# Verify data after the test has been "shot"
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+<verify>
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+# 8 is CURLE_WEIRD_SERVER_REPLY
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+<errorcode>
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+8
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+</errorcode>
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+<protocol>
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+AUTH SSL
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+</protocol>
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+</verify>
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+</testcase>
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--
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2.31.1
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