3571e53040
patches for easier mirroring, to eliminate a special copy, to make www.freebsd.org/security a full copy of security.freebsd.org and be eventually be the same. For now files are just sitting there. The symlinks are missing. Discussed on: www (repository location) Discussed with: simon (so)
155 lines
6.2 KiB
Text
155 lines
6.2 KiB
Text
-----BEGIN PGP SIGNED MESSAGE-----
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Hash: SHA1
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=============================================================================
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FreeBSD-SA-12:02.crypt Security Advisory
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The FreeBSD Project
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Topic: Incorrect crypt() hashing
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Category: core
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Module: libcrypt
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Announced: 2012-05-30
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Credits: Rubin Xu, Joseph Bonneau, Donting Yu
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Affects: All supported versions of FreeBSD.
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Corrected: 2012-05-30 12:01:28 UTC (RELENG_7, 7.4-STABLE)
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2012-05-30 12:01:28 UTC (RELENG_7_4, 7.4-RELEASE-p8)
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2012-05-30 12:01:28 UTC (RELENG_8, 8.3-STABLE)
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2012-05-30 12:01:28 UTC (RELENG_8_3, 8.3-RELEASE-p2)
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2012-05-30 12:01:28 UTC (RELENG_8_2, 8.2-RELEASE-p8)
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2012-05-30 12:01:28 UTC (RELENG_8_1, 8.1-RELEASE-p10)
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2012-05-30 12:01:28 UTC (RELENG_9, 9.0-STABLE)
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2012-05-30 12:01:28 UTC (RELENG_9_0, 9.0-RELEASE-p2)
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CVE Name: CVE-2012-2143
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For general information regarding FreeBSD Security Advisories,
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including descriptions of the fields above, security branches, and the
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following sections, please visit <URL:http://security.FreeBSD.org/>.
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I. Background
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The crypt(3) function performs password hashing with additional code added
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to deter key search attempts.
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II. Problem Description
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There is a programming error in the DES implementation used in crypt()
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when handling input which contains characters that can not be represented
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with 7-bit ASCII.
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III. Impact
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When the input contains characters with only the most significant bit set
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(0x80), that character and all characters after it will be ignored.
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IV. Workaround
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No workaround is available, but systems not using crypt(), or which only
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use it to handle 7-bit ASCII are not vulnerable. Note that, because
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DES does not have the computational complexity to defeat brute force
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search on modern computers, it is not recommended for new applications.
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V. Solution
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Perform one of the following:
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1) Upgrade your vulnerable system to 7-STABLE, 8-STABLE, or 9-STABLE,
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or to the RELENG_7_4, RELENG_8_3, RELENG_8_2, RELENG_8_1, or RELENG_9_0
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security branch dated after the correction date.
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2) To update your vulnerable system via a source code patch:
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The following patches have been verified to apply to FreeBSD 7.4,
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8.3, 8.2, 8.1 and 9.0 systems.
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a) Download the relevant patch from the location below, and verify the
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detached PGP signature using your PGP utility.
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# fetch http://security.FreeBSD.org/patches/SA-12:02/crypt.patch
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# fetch http://security.FreeBSD.org/patches/SA-12:02/crypt.patch.asc
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# cd /usr/src
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# patch < /path/to/patch
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# cd /usr/src/lib/libcrypt
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# make obj && make depend && make && make install
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NOTE: On the amd64 platform, the above procedure will not update the
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lib32 (i386 compatibility) libraries. On amd64 systems where the i386
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compatibility libraries are used, the operating system should instead
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be recompiled as described in
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<URL:http://www.FreeBSD.org/handbook/makeworld.html>
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3) To update your vulnerable system via a binary patch:
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Systems running 7.4-RELEASE, 8.3-RELEASE, 8.2-RELEASE, 8.1-RELEASE,
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or 9.0-RELEASE on the i386 or amd64 platforms can be updated via the
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freebsd-update(8) utility:
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# freebsd-update fetch
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# freebsd-update install
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VI. Correction details
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The following list contains the revision numbers of each file that was
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corrected in FreeBSD.
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CVS:
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Branch Revision
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Path
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- -------------------------------------------------------------------------
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RELENG_7
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src/secure/lib/libcrypt/crypt-des.c 1.16.24.1
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RELENG_7_4
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src/UPDATING 1.507.2.36.2.10
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src/sys/conf/newvers.sh 1.72.2.18.2.13
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src/secure/lib/libcrypt/crypt-des.c 1.16.40.2
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RELENG_8
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src/secure/lib/libcrypt/crypt-des.c 1.16.36.2
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RELENG_8_3
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src/UPDATING 1.632.2.26.2.4
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src/sys/conf/newvers.sh 1.83.2.15.2.6
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src/secure/lib/libcrypt/crypt-des.c 1.16.36.1.8.2
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RELENG_8_2
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src/UPDATING 1.632.2.19.2.10
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src/sys/conf/newvers.sh 1.83.2.12.2.13
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src/secure/lib/libcrypt/crypt-des.c 1.16.36.1.6.2
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RELENG_8_1
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src/UPDATING 1.632.2.14.2.13
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src/sys/conf/newvers.sh 1.83.2.10.2.14
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src/secure/lib/libcrypt/crypt-des.c 1.16.36.1.4.2
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RELENG_9
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src/secure/lib/libcrypt/crypt-des.c 1.16.42.2
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RELENG_9_0
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src/UPDATING 1.702.2.4.2.4
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src/sys/conf/newvers.sh 1.95.2.4.2.6
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src/secure/lib/libcrypt/crypt-des.c 1.16.42.1.2.2
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- -------------------------------------------------------------------------
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Subversion:
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Branch/path Revision
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- -------------------------------------------------------------------------
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stable/7/ r236304
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releng/7.4/ r236304
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stable/8/ r236304
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releng/8.3/ r236304
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releng/8.2/ r236304
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releng/8.1/ r236304
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stable/9/ r236304
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releng/9.0/ r236304
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- -------------------------------------------------------------------------
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VII. References
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http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2012-2143
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The latest revision of this advisory is available at
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http://security.FreeBSD.org/advisories/FreeBSD-SA-12:02.crypt.asc
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