FreeBSD Security Advisory FreeBSD-SA-22:08.zlib
- Go to: [ bottom of page ] [ top of archives ] [ this month ]
Date: Wed, 06 Apr 2022 04:08:24 UTC
-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA512 ============================================================================= FreeBSD-SA-22:08.zlib Security Advisory The FreeBSD Project Topic: zlib compression out-of-bounds write Category: zlib Module: contrib Announced: 2022-04-06 Credits: Danilo Ramos of Eideticom Tavis Ormandy of Google Project Zero Affects: All supported versions of FreeBSD. Corrected: 2022-04-04 19:30:33 UTC (stable/13, 13.1-STABLE) 2022-04-04 20:02:42 UTC (releng/13.1, 13.1-RC1-p1) 2022-04-06 03:04:19 UTC (releng/13.0, 13.0-RELEASE-p11) 2022-04-04 01:07:59 UTC (stable/12, 12.3-STABLE) 2022-04-06 03:06:39 UTC (releng/12.3, 12.3-RELEASE-p5) CVE Name: CVE-2018-25032 For general information regarding FreeBSD Security Advisories, including descriptions of the fields above, security branches, and the following sections, please visit <URL:https://security.FreeBSD.org/>. I. Background zlib is a compression library used by numerous applications, as well as some FreeBSD kernel components, to provide data compression/decompression routines. II. Problem Description Certain inputs can cause zlib's compression routine to overwrite an internal buffer with compressed data. This issue may require the use of uncommon or non-default compression parameters. III. Impact The out-of-bounds write may result in memory corruption and an application crash or kernel panic. IV. Workaround No workaround is available. V. Solution Upgrade your vulnerable system to a supported FreeBSD stable or release / security branch (releng) dated after the correction date, and reboot. Perform one of the following: 1) To update your vulnerable system via a binary patch: Systems running a RELEASE version of FreeBSD on the amd64, i386, or (on FreeBSD 13 and later) arm64 platforms can be updated via the freebsd-update(8) utility: # freebsd-update fetch # freebsd-update install # shutdown -r +10min "Rebooting for a security update" 2) 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. # fetch https://security.FreeBSD.org/patches/SA-22:08/zlib.patch # fetch https://security.FreeBSD.org/patches/SA-22:08/zlib.patch.asc # gpg --verify zlib.patch.asc b) Apply the patch. Execute the following commands as root: # cd /usr/src # patch < /path/to/patch c) Recompile your kernel as described in <URL:https://www.FreeBSD.org/handbook/kernelconfig.html>. Recompile the operating system using buildworld and installworld as described in <URL:https://www.FreeBSD.org/handbook/makeworld.html>. Reboot the system. VI. Correction details This issue is corrected by the corresponding Git commit hash or Subversion revision number in the following stable and release branches: Branch/path Hash Revision - ------------------------------------------------------------------------- stable/13/ c4727a47f18c stable/13-n250251 releng/13.1/ f5196112e8bd releng/13.1-n250070 releng/13.0/ 9854ff088002 releng/13.0-n244799 stable/12/ r371856 releng/12.3/ r371875 - ------------------------------------------------------------------------- For FreeBSD 13 and later: Run the following command to see which files were modified by a particular commit: # git show --stat <commit hash> Or visit the following URL, replacing NNNNNN with the hash: <URL:https://cgit.freebsd.org/src/commit/?id=NNNNNN> To determine the commit count in a working tree (for comparison against nNNNNNN in the table above), run: # git rev-list --count --first-parent HEAD For FreeBSD 12 and earlier: Run the following command to see which files were modified by a particular revision, replacing NNNNNN with the revision number: # svn diff -cNNNNNN --summarize svn://svn.freebsd.org/base Or visit the following URL, replacing NNNNNN with the revision number: <URL:https://svnweb.freebsd.org/base?view=revision&revision=NNNNNN> VII. References <other info on vulnerability> <URL:https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-25032> The latest revision of this advisory is available at <URL:https://security.FreeBSD.org/advisories/FreeBSD-SA-22:08.zlib.asc> -----BEGIN PGP SIGNATURE----- iQIzBAEBCgAdFiEE/A6HiuWv54gCjWNV05eS9J6n5cIFAmJNDgcACgkQ05eS9J6n 5cKzTxAAm61INadG6kdCuFYEYez9Fb3bT0L+bVElfmVhiQ80BqVKwE7EpeNN+OUC 820eYu5KnSGT2SKq6IIi605MUvhjpECLdjmdIEbER6G97nWxwSEEhpQ64br+3ely J7SJWYpR5ydsxOYitICHV6YDJNK2mIMl0IYhSPgJqwb0zMWIupGPYisgdlqUSJV4 SVxqQL8Z1GE+rUW2Br3QamENXkRRZwIUNpAxGfGK+YWjqjZ+378y6R5nj4+TL3c8 +kDKL4jLyyQxnmkhLjfdX2sFOhI7bxcsmj0JuutAaCwvxlZ8gPglKMKZLEz4fula hA6AuFFGpgoPpP2ZCThXglJ4UWYrPJhRX7c5G1W/mdaLZACeHwz+1SOW6v0Ud0GI fxI6uweov8zDp5RIjWHU5Ir40nE3WqwYVGamy4xWN0PnrfzYlMidP7bV9pakalUn lkXPIcFmgY6Yc8efPsHGoyskIjarquZ8gNqAv6CmumaHiu20PcPNXbwuMIVGABcf p1WEIOYD8C1eDsPnR+QiFj9/8JcN/MyElJOz8wFr/XdRkixGx2mqCxQt9d8QDAaF 84/phYipwC1rdPjQs9HTcI6x52+MiyJGU+W6o27uS2vIQYycqkCjc08viZP5bNKT kt281rEoIcvmv9HUzMXvjLzWGTGvGLw9lf5PueMzZwbkGV4o1fY= =7Iaq -----END PGP SIGNATURE-----