FreeBSD Security Advisory FreeBSD-SA-16:22.libarchive

Fabricante: FreeBSD
Fecha: 31/05/2016
Identificador: FreeBSD-SA-16:22.libarchive
FreeBSD Security Advisory FreeBSD-SA-16:22.libarchive
-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA512 ============================================================================= FreeBSD-SA-16:22.libarchive Security Advisory The FreeBSD Project Topic: Directory traversal in cpio(1) Category: contrib Module: libarchive Announced: 2016-05-31 Credits: Alexander Cherepanov Affects: All supported versions of FreeBSD Corrected: 2016-05-21 09:03:45 UTC (stable/10, 10.3-STABLE) 2016-05-31 16:35:03 UTC (releng/10.3, 10.3-RELEASE-p4) 2016-05-31 16:33:56 UTC (releng/10.2, 10.2-RELEASE-p18) 2016-05-31 16:32:42 UTC (releng/10.1, 10.1-RELEASE-p35) 2016-05-21 09:27:30 UTC (stable/9, 9.3-STABLE) 2016-05-31 16:23:56 UTC (releng/9.3, 9.3-RELEASE-p43) CVE Name: CVE-2015-2304 For general information regarding FreeBSD Security Advisories, including descriptions of the fields above, security branches, and the following sections, please visit . I. Background The libarchive(3) library provides a flexible interface for reading and writing streaming archive files such as tar(1) and cpio(1), and has been the basis for the FreeBSD implementation of the tar(1) and cpio(1) utilities since FreeBSD 5.3. II. Problem Description The cpio(1) tool from the libarchive(3) bundle is vulnerable to a directory traversal problem via absolute paths in an archive file. III. Impact A malicious archive file being unpacked can overwrite an arbitrary file on a filesystem, if the owner of the cpio process has write access to it. IV. Workaround No workaround is available. V. Solution Perform one of the following: 1) Upgrade your vulnerable system to a supported FreeBSD stable or release / security branch (releng) dated after the correction date. Reboot is not required. 2) To update your vulnerable system via a binary patch: Systems running a RELEASE version of FreeBSD on the i386 or amd64 platforms can be updated via the freebsd-update(8) utility: # freebsd-update fetch # freebsd-update install Reboot is not required. 3) To update your vulnerable system via a source code patch: The following patches have been verified to apply to the applicable FreeBSD release branches. a) Download the relevant patch from the location below, and verify the detached PGP signature using your PGP utility. [FreeBSD 10.x] # fetch https://security.FreeBSD.org/patches/SA-16:22/libarchive-10.patch # fetch https://security.FreeBSD.org/patches/SA-16:22/libarchive-10.patch.asc # gpg --verify libarchive-10.patch.asc [FreeBSD 9.3] # fetch https://security.FreeBSD.org/patches/SA-16:22/libarchive-9.patch # fetch https://security.FreeBSD.org/patches/SA-16:22/libarchive-9.patch.asc # gpg --verify libarchive-9.patch.asc b) Apply the patch. Execute the following commands as root: # cd /usr/src # patch < /path/to/patch c) Recompile the operating system using buildworld and installworld as described in . VI. Correction details The following list contains the correction revision numbers for each affected branch. Branch/path Revision - ------------------------------------------------------------------------- stable/9/ r300363 releng/9.3/ r301044 stable/10/ r300361 releng/10.1/ r301046 releng/10.2/ r301047 releng/10.3/ r301048 - ------------------------------------------------------------------------- To see which files were modified by a particular revision, run the following command, replacing NNNNNN with the revision number, on a machine with Subversion installed: # svn diff -cNNNNNN --summarize svn://svn.freebsd.org/base Or visit the following URL, replacing NNNNNN with the revision number: VII. References The latest revision of this advisory is available at -----BEGIN PGP SIGNATURE----- iQIcBAEBCgAGBQJXTcSSAAoJEO1n7NZdz2rnpSIQAL4Ao7qcCFcqckTLAwR3UyTe e65MD/dXcD+Zn6XWao5t/nLQRFyzJgD6p3HIahcPMBXdzaYOlYxVfU7wMlw95llZ mKruSMP1rT59zxwyP+aLh34aRMRmVu+/L8xMHThMBNyiIFjhiyLIvzm4+k+/vBHY V1Jc7RdEQr4A19zzhmklCMzttf2M85NggWDraPQfUMyjXwrLDc6Pc1x7w8w8/OAB Jyj9tiu883epPstgk8uKVqRaa96SGcwFt9Rsp8WZf0/rfk21BS2hNnlxrjPhdkAU s5KZnCqudbh4Uv0KRLO0htLTMo2QU0gP0d/QeoLBxaPo2VaXrB6jvv7KhDInIpRe xDQYuc3d/D1m0DkIIjglxKhtunozPdxL3PmzrkY/C3qgFY4RxBCPN60OJ9lTxC15 H6/FVljRpSFUST5goQ9jsAA+oJ6B+dD4sYU6kh1hTkHeCD/EA+QH66YwzZquGi/T 4oDNTLSwgfGH/1OzkkhuWCANvVkWO+EckSVX3/sEaud/Z2zRNV0dELbS2NUs3yGl sbAytECuvMMEx4FsCteLs9yKrTQmC+OrKBkEtUxoCMQi4eQsEGyH26mHM/L9MOP3 dyFP2V1dSd3392sGCvjInb9lxAmw5+by3nPzKVnIUW+jLaICdWFzwWhi7ycHupsU GH8PGGPIFUd81r7gzrF8 =+ZX7 -----END PGP SIGNATURE-----