134 lines
5.2 KiB
Text
134 lines
5.2 KiB
Text
-----BEGIN PGP SIGNED MESSAGE-----
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Hash: SHA512
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=============================================================================
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FreeBSD-SA-19:09.iconv Security Advisory
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The FreeBSD Project
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Topic: iconv buffer overflow
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Category: core
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Module: libc
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Announced: 2019-07-02
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Credits: Andrea Venturoli <security@netfence.it>, NetFence
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Affects: All supported versions of FreeBSD.
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Corrected: 2019-07-03 00:01:38 UTC (stable/12, 12.0-STABLE)
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2019-07-03 00:00:39 UTC (releng/12.0, 12.0-RELEASE-p7)
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2019-07-03 00:03:14 UTC (stable/11, 11.3-PRERELEASE)
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2019-07-03 00:00:39 UTC (releng/11.3, 11.3-RC3-p1)
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2019-07-03 00:00:39 UTC (releng/11.2, 11.2-RELEASE-p11)
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CVE Name: CVE-2019-5600
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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:https://security.FreeBSD.org/>.
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I. Background
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The iconv(3) API converts text data from one character encoding to another
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and is available as part of the standard C library (libc).
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II. Problem Description
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With certain inputs, iconv may write beyond the end of the output buffer.
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III. Impact
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Depending on the way in which iconv is used, an attacker may be able to
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create a denial of service, provoke incorrect program behavior, or induce a
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remote code execution. iconv is a libc library function and the nature of
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possible attacks will depend on the way in which iconv is used by
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applications or daemons.
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IV. Workaround
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No workaround is available. Stack canaries (-fstack-protector), which are
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enabled by default, provide a degreee of defense against code injection but
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not against denial of service.
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V. Solution
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Upgrade your vulnerable system to a supported FreeBSD stable or release /
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security branch (releng) dated after the correction date. Restart any
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potentially affected daemons.
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Perform one of the following:
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1) 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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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 https://security.FreeBSD.org/patches/SA-19:09/iconv.patch
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# fetch https://security.FreeBSD.org/patches/SA-19:09/iconv.patch.asc
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# gpg --verify iconv.patch.asc
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b) Apply the patch. 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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c) Recompile the operating system using buildworld and installworld as
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described in <URL:https://www.FreeBSD.org/handbook/makeworld.html>.
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Restart all daemons that use the library, or reboot the system.
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VI. Correction details
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The following list contains the correction revision numbers for each
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affected branch.
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Branch/path Revision
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- -------------------------------------------------------------------------
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stable/12/ r349622
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releng/12.0/ r349621
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stable/11/ r349624
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releng/11.3/ r349621
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releng/11.2/ r349621
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- -------------------------------------------------------------------------
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To see which files were modified by a particular revision, run the
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following command, replacing NNNNNN with the revision number, on a
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machine with Subversion installed:
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# svn diff -cNNNNNN --summarize svn://svn.freebsd.org/base
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Or visit the following URL, replacing NNNNNN with the revision number:
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<URL:https://svnweb.freebsd.org/base?view=revision&revision=NNNNNN>
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VII. References
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<URL:https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-5600>
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The latest revision of this advisory is available at
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<URL:https://security.FreeBSD.org/advisories/FreeBSD-SA-19:09.iconv.asc>
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