From 50f0feee5a63aac4e27bf95c07e62f786fc78136 Mon Sep 17 00:00:00 2001 From: CentOS Sources Date: Apr 07 2020 09:14:37 +0000 Subject: import slirp4netns-0.1-4.dev.gitc4e1bc5.module+el8.1.0+5654+5237a55d --- diff --git a/SOURCES/slirp4netns-CVE-2020-7039.patch b/SOURCES/slirp4netns-CVE-2020-7039.patch new file mode 100644 index 0000000..dae12a8 --- /dev/null +++ b/SOURCES/slirp4netns-CVE-2020-7039.patch @@ -0,0 +1,123 @@ +From 2655fffed7a9e765bcb4701dd876e9dab975f289 Mon Sep 17 00:00:00 2001 +From: Samuel Thibault +Date: Wed, 8 Jan 2020 00:58:48 +0100 +Subject: [PATCH] tcp_emu: Fix oob access + +The main loop only checks for one available byte, while we sometimes +need two bytes. + +2.24.1 + +From 82ebe9c370a0e2970fb5695aa19aa5214a6a1c80 Mon Sep 17 00:00:00 2001 +From: Prasad J Pandit +Date: Thu, 9 Jan 2020 15:12:28 +0530 +Subject: [PATCH] slirp: use correct size while emulating commands + +While emulating services in tcp_emu(), it uses 'mbuf' size +'m->m_size' to write commands via snprintf(3). Use M_FREEROOM(m) +size to avoid possible OOB access. + +Signed-off-by: Prasad J Pandit +Signed-off-by: Samuel Thibault +Message-Id: <20200109094228.79764-3-ppandit@redhat.com> + +2.24.1 + +From ce131029d6d4a405cb7d3ac6716d03e58fb4a5d9 Mon Sep 17 00:00:00 2001 +From: Prasad J Pandit +Date: Thu, 9 Jan 2020 15:12:27 +0530 +Subject: [PATCH] slirp: use correct size while emulating IRC commands + +While emulating IRC DCC commands, tcp_emu() uses 'mbuf' size +'m->m_size' to write DCC commands via snprintf(3). This may +lead to OOB write access, because 'bptr' points somewhere in +the middle of 'mbuf' buffer, not at the start. Use M_FREEROOM(m) +size to avoid OOB access. + +Reported-by: Vishnu Dev TJ +Signed-off-by: Prasad J Pandit +Reviewed-by: Samuel Thibault +Message-Id: <20200109094228.79764-2-ppandit@redhat.com> + +--- + CHANGELOG.md | 1 + + src/tcp_subr.c | 7 +++++++ + 2 files changed, 8 insertions(+) + +diff -up slirp4netns-c4e1bc5a5e6987f3a352ca524f13320a2d483398/qemu/slirp/tcp_subr.c.CVE-2020-7039 slirp4netns-c4e1bc5a5e6987f3a352ca524f13320a2d483398/qemu/slirp/tcp_subr.c +--- slirp4netns-c4e1bc5a5e6987f3a352ca524f13320a2d483398/qemu/slirp/tcp_subr.c.CVE-2020-7039 2020-01-16 11:13:39.558653385 +0100 ++++ slirp4netns-c4e1bc5a5e6987f3a352ca524f13320a2d483398/qemu/slirp/tcp_subr.c 2020-01-16 14:23:54.027184429 +0100 +@@ -704,7 +704,7 @@ tcp_emu(struct socket *so, struct mbuf * + n4 = (laddr & 0xff); + + m->m_len = bptr - m->m_data; /* Adjust length */ +- m->m_len += snprintf(bptr, m->m_size - m->m_len, ++ m->m_len += snprintf(bptr, M_FREEROOM(m), + "ORT %d,%d,%d,%d,%d,%d\r\n%s", + n1, n2, n3, n4, n5, n6, x==7?buff:""); + return 1; +@@ -737,7 +737,7 @@ tcp_emu(struct socket *so, struct mbuf * + n4 = (laddr & 0xff); + + m->m_len = bptr - m->m_data; /* Adjust length */ +- m->m_len += snprintf(bptr, m->m_size - m->m_len, ++ m->m_len += snprintf(bptr, M_FREEROOM(m), + "27 Entering Passive Mode (%d,%d,%d,%d,%d,%d)\r\n%s", + n1, n2, n3, n4, n5, n6, x==7?buff:""); + +@@ -763,7 +763,7 @@ tcp_emu(struct socket *so, struct mbuf * + if (m->m_data[m->m_len-1] == '\0' && lport != 0 && + (so = tcp_listen(slirp, INADDR_ANY, 0, so->so_laddr.s_addr, + htons(lport), SS_FACCEPTONCE)) != NULL) +- m->m_len = snprintf(m->m_data, m->m_size, "%d", ++ m->m_len = snprintf(m->m_data, M_ROOM(m), "%d", + ntohs(so->so_fport)) + 1; + return 1; + +@@ -783,7 +783,7 @@ tcp_emu(struct socket *so, struct mbuf * + return 1; + } + m->m_len = bptr - m->m_data; /* Adjust length */ +- m->m_len += snprintf(bptr, m->m_size, ++ m->m_len += snprintf(bptr, M_FREEROOM(m), + "DCC CHAT chat %lu %u%c\n", + (unsigned long)ntohl(so->so_faddr.s_addr), + ntohs(so->so_fport), 1); +@@ -794,7 +794,7 @@ tcp_emu(struct socket *so, struct mbuf * + return 1; + } + m->m_len = bptr - m->m_data; /* Adjust length */ +- m->m_len += snprintf(bptr, m->m_size, ++ m->m_len += snprintf(bptr, M_FREEROOM(m), + "DCC SEND %s %lu %u %u%c\n", buff, + (unsigned long)ntohl(so->so_faddr.s_addr), + ntohs(so->so_fport), n1, 1); +@@ -805,7 +805,7 @@ tcp_emu(struct socket *so, struct mbuf * + return 1; + } + m->m_len = bptr - m->m_data; /* Adjust length */ +- m->m_len += snprintf(bptr, m->m_size, ++ m->m_len += snprintf(bptr, M_FREEROOM(m), + "DCC MOVE %s %lu %u %u%c\n", buff, + (unsigned long)ntohl(so->so_faddr.s_addr), + ntohs(so->so_fport), n1, 1); +@@ -892,6 +892,9 @@ tcp_emu(struct socket *so, struct mbuf * + break; + + case 5: ++ if (bptr == m->m_data + m->m_len - 1) ++ return 1; /* We need two bytes */ ++ + /* + * The difference between versions 1.0 and + * 2.0 is here. For future versions of +@@ -907,6 +910,9 @@ tcp_emu(struct socket *so, struct mbuf * + /* This is the field containing the port + * number that RA-player is listening to. + */ ++ if (bptr == m->m_data + m->m_len - 1) ++ return 1; /* We need two bytes */ ++ + lport = (((u_char*)bptr)[0] << 8) + + ((u_char *)bptr)[1]; + if (lport < 6970) diff --git a/SPECS/slirp4netns.spec b/SPECS/slirp4netns.spec index d292425..7e8090e 100644 --- a/SPECS/slirp4netns.spec +++ b/SPECS/slirp4netns.spec @@ -4,7 +4,7 @@ Name: slirp4netns Version: 0.1 -Release: 3.dev.git%{shortcommit0}%{?dist} +Release: 4.dev.git%{shortcommit0}%{?dist} # no go-md2man in ix86 and ppc64 ExcludeArch: %{ix86} ppc64 Summary: slirp for network namespaces @@ -12,6 +12,7 @@ License: GPLv2 URL: %{git0} Source0: %{git0}/archive/%{commit0}/%{name}-%{shortcommit0}.tar.gz Patch0: slirp4netns-CVE-2019-14378.patch +Patch1: slirp4netns-CVE-2020-7039.patch BuildRequires: autoconf BuildRequires: automake BuildRequires: gcc @@ -56,6 +57,10 @@ make DESTDIR=%{buildroot} install install-man %{_mandir}/man1/%{name}.1.gz %changelog +* Thu Jan 16 2020 Jindrich Novy - 0.1-4.dev.gitc4e1bc5 +- backport fix for CVE-2020-7039 +- Resolves: #1791577 + * Fri Sep 27 2019 Jindrich Novy - 0.1-3.dev.gitc4e1bc5 - Fix CVE-2019-14378 (#1755595).