fef748c3be
Fix Denial of Service vulnerability in named(8) with DNS64. [13:01] Fix Denial of Service vulnerability in libc's glob(3) functionality. [13:02] Security: CVE-2012-5688 Security: FreeBSD-SA-13:01.bind Security: CVE-2010-2632 Security: FreeBSD-SA-13:02.libc
114 lines
4 KiB
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114 lines
4 KiB
Text
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=============================================================================
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FreeBSD-SA-13:02.libc Security Advisory
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The FreeBSD Project
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Topic: glob(3) related resource exhaustion
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Category: core
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Module: libc
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Announced: 2013-02-19
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Affects: All supported versions of FreeBSD.
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Corrected: 2013-02-05 09:53:32 UTC (stable/7, 7.4-STABLE)
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2013-02-19 13:27:20 UTC (releng/7.4, 7.4-RELEASE-p12)
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2013-02-05 09:53:32 UTC (stable/8, 8.3-STABLE)
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2013-02-19 13:27:20 UTC (releng/8.3, 8.3-RELEASE-p6)
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2013-02-05 09:53:32 UTC (stable/9, 9.1-STABLE)
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2013-02-19 13:27:20 UTC (releng/9.0, 9.0-RELEASE-p6)
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2013-02-19 13:27:20 UTC (releng/9.1, 9.1-RELEASE-p1)
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CVE Name: CVE-2010-2632
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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 glob(3) function is a pathname generator that implements the rules for
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file name pattern matching used by the shell.
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II. Problem Description
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GLOB_LIMIT is supposed to limit the number of paths to prevent against
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memory or CPU attacks. The implementation however is insufficient.
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III. Impact
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An attacker that is able to exploit this vulnerability could cause excessive
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memory or CPU usage, resulting in a Denial of Service. A common target for
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a remote attacker could be ftpd(8).
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IV. Workaround
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No workaround is available.
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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 a supported FreeBSD stable or
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release / security branch (releng) 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 the applicable
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FreeBSD release branches.
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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-13:02/libc.patch
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# fetch http://security.FreeBSD.org/patches/SA-13:02/libc.patch.asc
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# gpg --verify libc.patch.asc
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b) Execute the following commands as root:
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# cd /usr/src
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# patch < /path/to/patch
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Recompile the operating system using buildworld and installworld as
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described in <URL:http://www.FreeBSD.org/handbook/makeworld.html>.
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Restart all daemons, or reboot the system.
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3) To update your vulnerable system via a binary patch:
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Systems running a RELEASE version of FreeBSD on the i386 or amd64
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platforms can be updated via the freebsd-update(8) utility:
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# freebsd-update fetch
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# freebsd-update install
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Restart all daemons, or reboot the system.
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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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Branch/path Revision
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- -------------------------------------------------------------------------
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stable/7/ r246357
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releng/7.4/ r246989
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stable/8/ r246357
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releng/8.3/ r246989
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stable/9/ r246357
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releng/9.0/ r246989
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releng/9.1/ r246989
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- -------------------------------------------------------------------------
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VII. References
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http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2010-2632
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The latest revision of this advisory is available at
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http://security.FreeBSD.org/advisories/FreeBSD-SA-13:02.libc.asc
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