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From a1ec463c8207bde97b3575d12e396e999a55a8d0 Mon Sep 17 00:00:00 2001
From: Patrick Monnerat <patrick@monnerat.net>
Date: Tue, 7 Sep 2021 13:26:42 +0200
Subject: [PATCH] ftp,imap,pop3,smtp: reject STARTTLS server response
 pipelining

If a server pipelines future responses within the STARTTLS response, the
former are preserved in the pingpong cache across TLS negotiation and
used as responses to the encrypted commands.

This fix detects pipelined STARTTLS responses and rejects them with an
error.

CVE-2021-22947

Bug: https://curl.se/docs/CVE-2021-22947.html

Upstream-commit: 8ef147c43646e91fdaad5d0e7b60351f842e5c68
Signed-off-by: Kamil Dudka <kdudka@redhat.com>
---
 lib/ftp.c               |  3 +++
 lib/imap.c              |  4 +++
 lib/pop3.c              |  4 +++
 lib/smtp.c              |  4 +++
 tests/data/Makefile.inc |  2 +-
 tests/data/test980      | 52 ++++++++++++++++++++++++++++++++++++
 tests/data/test981      | 59 +++++++++++++++++++++++++++++++++++++++++
 tests/data/test982      | 57 +++++++++++++++++++++++++++++++++++++++
 tests/data/test983      | 52 ++++++++++++++++++++++++++++++++++++
 9 files changed, 236 insertions(+), 1 deletion(-)
 create mode 100644 tests/data/test980
 create mode 100644 tests/data/test981
 create mode 100644 tests/data/test982
 create mode 100644 tests/data/test983

diff --git a/lib/ftp.c b/lib/ftp.c
index 71f998e..e920138 100644
--- a/lib/ftp.c
+++ b/lib/ftp.c
@@ -2688,6 +2688,9 @@ static CURLcode ftp_statemach_act(struct connectdata *conn)
     case FTP_AUTH:
       /* we have gotten the response to a previous AUTH command */
 
+      if(pp->cache_size)
+        return CURLE_WEIRD_SERVER_REPLY; /* Forbid pipelining in response. */
+
       /* RFC2228 (page 5) says:
        *
        * If the server is willing to accept the named security mechanism,
diff --git a/lib/imap.c b/lib/imap.c
index feb7445..09bc5d6 100644
--- a/lib/imap.c
+++ b/lib/imap.c
@@ -939,6 +939,10 @@ static CURLcode imap_state_starttls_resp(struct connectdata *conn,
 
   (void)instate; /* no use for this yet */
 
+  /* Pipelining in response is forbidden. */
+  if(conn->proto.imapc.pp.cache_size)
+    return CURLE_WEIRD_SERVER_REPLY;
+
   if(imapcode != IMAP_RESP_OK) {
     if(data->set.use_ssl != CURLUSESSL_TRY) {
       failf(data, "STARTTLS denied");
diff --git a/lib/pop3.c b/lib/pop3.c
index 7698d1c..dccfced 100644
--- a/lib/pop3.c
+++ b/lib/pop3.c
@@ -750,6 +750,10 @@ static CURLcode pop3_state_starttls_resp(struct connectdata *conn,
 
   (void)instate; /* no use for this yet */
 
+  /* Pipelining in response is forbidden. */
+  if(conn->proto.pop3c.pp.cache_size)
+    return CURLE_WEIRD_SERVER_REPLY;
+
   if(pop3code != '+') {
     if(data->set.use_ssl != CURLUSESSL_TRY) {
       failf(data, "STARTTLS denied");
diff --git a/lib/smtp.c b/lib/smtp.c
index 1defb25..1f89777 100644
--- a/lib/smtp.c
+++ b/lib/smtp.c
@@ -685,6 +685,10 @@ static CURLcode smtp_state_starttls_resp(struct connectdata *conn,
 
   (void)instate; /* no use for this yet */
 
+  /* Pipelining in response is forbidden. */
+  if(conn->proto.smtpc.pp.cache_size)
+    return CURLE_WEIRD_SERVER_REPLY;
+
   if(smtpcode != 220) {
     if(data->set.use_ssl != CURLUSESSL_TRY) {
       failf(data, "STARTTLS denied, code %d", smtpcode);
diff --git a/tests/data/Makefile.inc b/tests/data/Makefile.inc
index 163ce59..42b0569 100644
--- a/tests/data/Makefile.inc
+++ b/tests/data/Makefile.inc
@@ -108,7 +108,7 @@ test927 test928 test929 test930 test931 test932 test933 test934 test935 \
 test936 test937 test938 test939 test940 test941 test942 test943 test944 \
 test945 test946 test947 test948 test949 test950 test951 test952 \
 \
-test984 test985 test986 \
+test980 test981 test982 test983 test984 test985 test986 \
 \
 test1000 test1001 test1002 test1003 test1004 test1005 test1006 test1007 \
 test1008 test1009 test1010 test1011 test1012 test1013 test1014 test1015 \
diff --git a/tests/data/test980 b/tests/data/test980
new file mode 100644
index 0000000..97567f8
--- /dev/null
+++ b/tests/data/test980
@@ -0,0 +1,52 @@
+<testcase>
+<info>
+<keywords>
+SMTP
+STARTTLS
+</keywords>
+</info>
+
+#
+# Server-side
+<reply>
+<servercmd>
+CAPA STARTTLS
+AUTH PLAIN
+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
+REPLY AUTH 535 5.7.8 Authentication credentials invalid
+</servercmd>
+</reply>
+
+#
+# Client-side
+<client>
+<features>
+SSL
+</features>
+<server>
+smtp
+</server>
+ <name>
+SMTP STARTTLS pipelined server response
+ </name>
+<stdin>
+mail body
+</stdin>
+ <command>
+smtp://%HOSTIP:%SMTPPORT/%TESTNUMBER --mail-rcpt recipient@example.com --mail-from sender@example.com -u user:secret --ssl --sasl-ir -T -
+</command>
+</client>
+
+#
+# Verify data after the test has been "shot"
+<verify>
+# 8 is CURLE_WEIRD_SERVER_REPLY
+<errorcode>
+8
+</errorcode>
+<protocol>
+EHLO %TESTNUMBER
+STARTTLS
+</protocol>
+</verify>
+</testcase>
diff --git a/tests/data/test981 b/tests/data/test981
new file mode 100644
index 0000000..2b98ce4
--- /dev/null
+++ b/tests/data/test981
@@ -0,0 +1,59 @@
+<testcase>
+<info>
+<keywords>
+IMAP
+STARTTLS
+</keywords>
+</info>
+
+#
+# Server-side
+<reply>
+<servercmd>
+CAPA STARTTLS
+REPLY STARTTLS A002 BAD currently unavailable\r\nA003 OK Authenticated\r\nA004 OK Accepted
+REPLY LOGIN A003 BAD Authentication credentials invalid
+</servercmd>
+</reply>
+
+#
+# Client-side
+<client>
+<features>
+SSL
+</features>
+<server>
+imap
+</server>
+ <name>
+IMAP STARTTLS pipelined server response
+ </name>
+ <command>
+imap://%HOSTIP:%IMAPPORT/%TESTNUMBER -T log/upload%TESTNUMBER -u user:secret --ssl
+</command>
+<file name="log/upload%TESTNUMBER">
+Date: Mon, 7 Feb 1994 21:52:25 -0800 (PST)
+From: Fred Foobar <foobar@example.COM>
+Subject: afternoon meeting
+To: joe@example.com
+Message-Id: <B27397-0100000@example.COM>
+MIME-Version: 1.0
+Content-Type: TEXT/PLAIN; CHARSET=US-ASCII
+
+Hello Joe, do you think we can meet at 3:30 tomorrow?
+</file>
+</client>
+
+#
+# Verify data after the test has been "shot"
+<verify>
+# 8 is CURLE_WEIRD_SERVER_REPLY
+<errorcode>
+8
+</errorcode>
+<protocol>
+A001 CAPABILITY
+A002 STARTTLS
+</protocol>
+</verify>
+</testcase>
diff --git a/tests/data/test982 b/tests/data/test982
new file mode 100644
index 0000000..9e07cc0
--- /dev/null
+++ b/tests/data/test982
@@ -0,0 +1,57 @@
+<testcase>
+<info>
+<keywords>
+POP3
+STARTTLS
+</keywords>
+</info>
+
+#
+# Server-side
+<reply>
+<servercmd>
+CAPA STLS USER
+REPLY STLS -ERR currently unavailable\r\n+OK user accepted\r\n+OK authenticated
+REPLY PASS -ERR Authentication credentials invalid
+</servercmd>
+<data nocheck="yes">
+From: me@somewhere
+To: fake@nowhere
+
+body
+
+--
+  yours sincerely
+</data>
+</reply>
+
+#
+# Client-side
+<client>
+<features>
+SSL
+</features>
+<server>
+pop3
+</server>
+ <name>
+POP3 STARTTLS pipelined server response
+ </name>
+ <command>
+pop3://%HOSTIP:%POP3PORT/%TESTNUMBER -u user:secret --ssl
+ </command>
+</client>
+
+#
+# Verify data after the test has been "shot"
+<verify>
+# 8 is CURLE_WEIRD_SERVER_REPLY
+<errorcode>
+8
+</errorcode>
+<protocol>
+CAPA
+STLS
+</protocol>
+</verify>
+</testcase>
diff --git a/tests/data/test983 b/tests/data/test983
new file mode 100644
index 0000000..300ec45
--- /dev/null
+++ b/tests/data/test983
@@ -0,0 +1,52 @@
+<testcase>
+<info>
+<keywords>
+FTP
+STARTTLS
+</keywords>
+</info>
+
+#
+# Server-side
+<reply>
+<servercmd>
+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
+REPLY PASS 530 Login incorrect
+</servercmd>
+</reply>
+
+# Client-side
+<client>
+<features>
+SSL
+</features>
+<server>
+ftp
+</server>
+ <name>
+FTP STARTTLS pipelined server response
+ </name>
+<file name="log/test%TESTNUMBER.txt">
+data
+    to
+      see
+that FTPS
+works
+  so does it?
+</file>
+ <command>
+--ssl --ftp-ssl-control ftp://%HOSTIP:%FTPPORT/%TESTNUMBER -T log/test%TESTNUMBER.txt -u user:secret -P %CLIENTIP
+</command>
+</client>
+
+# Verify data after the test has been "shot"
+<verify>
+# 8 is CURLE_WEIRD_SERVER_REPLY
+<errorcode>
+8
+</errorcode>
+<protocol>
+AUTH SSL
+</protocol>
+</verify>
+</testcase>
-- 
2.31.1