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FreeBSD Security Advisory - OpenSSL

FreeBSD Security Advisory - OpenSSL
Posted Dec 1, 2010
Site security.freebsd.org

FreeBSD Security Advisory - A race condition exists in the OpenSSL TLS server extension code parsing when used in a multi-threaded application, which uses OpenSSL's internal caching mechanism. The race condition can lead to a buffer overflow. A double free exists in the SSL client ECDH handling code, when processing specially crafted public keys with invalid prime numbers.

tags | advisory, overflow
systems | freebsd
advisories | CVE-2010-3864, CVE-2010-2939
MD5 | 8b28b10485c5cff7c810ee227ee048b1

FreeBSD Security Advisory - OpenSSL

Change Mirror Download
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=============================================================================
FreeBSD-SA-10:10.openssl Security Advisory
The FreeBSD Project

Topic: OpenSSL multiple vulnerabilities

Category: contrib
Module: openssl
Announced: 2010-11-29
Credits: Georgi Guninski, Rob Hulswit
Affects: FreeBSD 7.0 and later
Corrected: 2010-11-26 22:50:58 UTC (RELENG_8, 8.1-STABLE)
2010-11-29 20:43:06 UTC (RELENG_8_1, 8.1-RELEASE-p2)
2010-11-29 20:43:06 UTC (RELENG_8_0, 8.0-RELEASE-p6)
2010-11-28 13:45:51 UTC (RELENG_7, 7.3-STABLE)
2010-11-29 20:43:06 UTC (RELENG_7_3, 7.3-RELEASE-p4)
2010-11-29 20:43:06 UTC (RELENG_7_1, 7.1-RELEASE-p16)
CVE Name: CVE-2010-2939, CVE-2010-3864

For general information regarding FreeBSD Security Advisories,
including descriptions of the fields above, security branches, and the
following sections, please visit <URL:http://security.FreeBSD.org/>.

I. Background

FreeBSD includes software from the OpenSSL Project. The OpenSSL Project is
a collaborative effort to develop a robust, commercial-grade, full-featured
Open Source toolkit implementing the Secure Sockets Layer (SSL v2/v3)
and Transport Layer Security (TLS v1) protocols as well as a full-strength
general purpose cryptography library.

II. Problem Description

A race condition exists in the OpenSSL TLS server extension code
parsing when used in a multi-threaded application, which uses
OpenSSL's internal caching mechanism. The race condition can lead to
a buffer overflow. [CVE-2010-3864]

A double free exists in the SSL client ECDH handling code, when
processing specially crafted public keys with invalid prime
numbers. [CVE-2010-2939]

III. Impact

For affected server applications, an attacker may be able to utilize
the buffer overflow to crash the application or potentially run
arbitrary code with the privileges of the application. [CVE-2010-3864].

It may be possible to cause a DoS or potentially execute arbitrary in
the context of the user connection to a malicious SSL server.
[CVE-2010-2939]

IV. Workaround

No workaround is available, but CVE-2010-3864 only affects FreeBSD 8.0
and later.

It should also be noted that CVE-2010-3864 affects neither the Apache
HTTP server nor Stunnel.

V. Solution

Perform one of the following:

1) Upgrade your vulnerable system to 7-STABLE or 8-STABLE, or to the
RELENG_8_1, RELENG_8_0, RELENG_7_3, or RELENG_7_1 security branch
dated after the correction date.

2) To update your vulnerable system via a source code patch:

The following patches have been verified to apply to FreeBSD 7.1, 7.3,
8.0 and 8.1 systems.

a) Download the relevant patch from the location below, and verify the
detached PGP signature using your PGP utility.

[FreeBSD 7.x]
# fetch http://security.FreeBSD.org/patches/SA-10:10/openssl7.patch
# fetch http://security.FreeBSD.org/patches/SA-10:10/openssl7.patch.asc

[FreeBSD 8.x]
# fetch http://security.FreeBSD.org/patches/SA-10:10/openssl.patch
# fetch http://security.FreeBSD.org/patches/SA-10:10/openssl.patch.asc

b) Execute the following commands as root:

# cd /usr/src
# patch < /path/to/patch
# cd /usr/src/secure/lib/libssl
# make obj && make depend && make && make install

NOTE: On the amd64 platform, the above procedure will not update the
lib32 (i386 compatibility) libraries. On amd64 systems where the i386
compatibility libraries are used, the operating system should instead
be recompiled as described in
<URL:http://www.FreeBSD.org/handbook/makeworld.html>

3) To update your vulnerable system via a binary patch:

Systems running 7.1-RELEASE, 7.3-RELEASE, 8.0-RELEASE or 8.1-RELEASE
on the i386 or amd64 platforms can be updated via the
freebsd-update(8) utility:

# freebsd-update fetch
# freebsd-update install

VI. Correction details

The following list contains the revision numbers of each file that was
corrected in FreeBSD.

CVS:

Branch Revision
Path
- -------------------------------------------------------------------------
RELENG_7_3
src/UPDATING 1.507.2.34.2.6
src/sys/conf/newvers.sh 1.72.2.16.2.8
src/crypto/openssl/ssl/s3_clnt.c 1.1.1.14.2.1.4.1
RELENG_7_1
src/UPDATING 1.507.2.13.2.19
src/sys/conf/newvers.sh 1.72.2.9.2.20
src/crypto/openssl/ssl/s3_clnt.c 1.1.1.14.6.2
RELENG_8_1
src/UPDATING 1.632.2.14.2.5
src/sys/conf/newvers.sh 1.83.2.10.2.6
src/crypto/openssl/ssl/s3_clnt.c 1.3.2.1.2.1
src/crypto/openssl/ssl/t1_lib.c 1.2.2.1.2.1
RELENG_8_0
src/UPDATING 1.632.2.7.2.9
src/sys/conf/newvers.sh 1.83.2.6.2.9
src/crypto/openssl/ssl/s3_clnt.c 1.3.4.1
src/crypto/openssl/ssl/t1_lib.c 1.2.4.1
- -------------------------------------------------------------------------

Subversion:

Branch/path Revision
- -------------------------------------------------------------------------
stable/7/ r215997
releng/7.3/ r216063
releng/7.1/ r216063
stable/8/ r215912
releng/8.0/ r216063
releng/8.1/ r216063
- -------------------------------------------------------------------------

VII. References

https://bugzilla.redhat.com/show_bug.cgi?id=649304
http://www.openssl.org/news/secadv_20101116.txt
http://www.mail-archive.com/openssl-dev@openssl.org/msg28043.html
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2010-2939
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2010-3864

The latest revision of this advisory is available at
http://security.FreeBSD.org/advisories/FreeBSD-SA-10:10.openssl.asc
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