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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2015.2031 shell injection vulnerability in patch(1) 6 August 2015 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: bsdpatch Publisher: FreeBSD Operating System: FreeBSD Impact/Access: Execute Arbitrary Code/Commands -- Existing Account Resolution: Patch/Upgrade CVE Names: CVE-2015-1418 Original Bulletin: ftp://ftp.freebsd.org/pub/FreeBSD/CERT/advisories/FreeBSD-SA-15:18.bsdpatch.asc - --------------------------BEGIN INCLUDED TEXT-------------------- - -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA512 ============================================================================= FreeBSD-SA-15:18.bsdpatch Security Advisory The FreeBSD Project Topic: shell injection vulnerability in patch(1) Category: contrib Module: patch Announced: 2015-08-05 Credits: Martin Natano Affects: FreeBSD 10.x. Corrected: 2015-08-05 22:05:02 UTC (stable/10, 10.2-PRERELEASE) 2015-08-05 22:05:02 UTC (stable/10, 10.2-BETA2-p3) 2015-08-05 22:05:12 UTC (releng/10.2, 10.2-RC1-p2) 2015-08-05 22:05:12 UTC (releng/10.2, 10.2-RC2-p1) 2015-08-05 22:05:18 UTC (releng/10.1, 10.1-RELEASE-p17) CVE Name: CVE-2015-1418 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 The patch(1) utility takes a patch file produced by the diff(1) program and apply the differences to an original file, producing a patched version. The patch(1) utility supports patches that uses ed(1) script format, as required by the POSIX.1-2008 standard. ed(1) is a line-oriented text editor. II. Problem Description Due to insufficient sanitization of the input patch stream, it is possible for a patch file to cause patch(1) to pass certain ed(1) scripts to the ed(1) editor, which would run commands. III. Impact This issue could be exploited to execute arbitrary commands as the user invoking patch(1) against a specically crafted patch file, which could be leveraged to obtain elevated privileges. IV. Workaround No workaround is available, but systems where a privileged user does not make use of patches without proper validation are not affected. 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. A reboot is not required after updating. 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 A reboot is not required after updating. 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. # fetch https://security.FreeBSD.org/patches/SA-15:18/bsdpatch.patch # fetch https://security.FreeBSD.org/patches/SA-15:18/bsdpatch.patch.asc # gpg --verify bsdpatch.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 <URL:https://www.FreeBSD.org/handbook/makeworld.html>. VI. Correction details The following list contains the correction revision numbers for each affected branch. Branch/path Revision - - ------------------------------------------------------------------------- stable/10/ r286348 releng/10.1/ r286351 releng/10.2/ r286350 - - ------------------------------------------------------------------------- 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: <URL:https://svnweb.freebsd.org/base?view=revision&revision=NNNNNN> VII. References <URL:https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-1418> The latest revision of this advisory is available at <URL:https://security.FreeBSD.org/advisories/FreeBSD-SA-15:18.bsdpatch.asc> - -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.1.6 (FreeBSD) iQIcBAEBCgAGBQJVwoplAAoJEO1n7NZdz2rn8D4QAM0077U1nLiJFIU1VcM9IOKp GeZ/w9SnkrKqKzAQpq3QS1hmw0TxvP8kuJNuRVFF6M15Woprfxccb8mDxM0ntru4 t8rq/QLO2jMWopf67Spv6jr6GLLQXkiyRwLEyr7L8a7MbrFwjO1wYt+8GnQ6Nsvn kNfCnbNKPr1gNYM1XsLS7Ej1kl7aBx3xGQXU4d9HlOs/1X7rnPCnGKuc3ZD2Z/N4 zu8pV4NMFhWyJsax+FVYEFxwyd2uEb73A35nz/sQhGiwGOCtL424KG+hwj9mnm45 8f4m+53b6RDcBh6xU41fghMsac2PVCzY2r9GXXXJNlfEa+KnSN8yC+CvtXYEM9BX 9Y5g6i++RVLLT7mwFdG86FjZxSGpDBXlkpZ4I9qiS4YC8MFO4qC7SFzufxtfOcg+ R+QSj+DWOfeHDcXjEkHGlqTW9poE2EDWXDLwlEoOykh9NLyWl6enYd8ZEI3GUqyJ FgKiICrs1vUuGhOhTCgjyQjQUc6jaV/GzhLBJfyxz5xYDpr7DIILxJ8uki2FJcHS tZhlNu6JNqpBlsWNspqjw7NSP2j58Uj0bBdwWvFNX8otQiIXVfkdY8RCjxstq5lT 3bcF6akAFEBx/f/VYM1lswLM/XdbORYC3asLu84BP541EDqdx9d88TeTKNPvyb4Q sGJ763WSlsoLrQDr8CUt =iR0L - -----END PGP SIGNATURE----- - --------------------------END INCLUDED TEXT-------------------- You have received this e-mail bulletin as a result of your organisation's registration with AusCERT. The mailing list you are subscribed to is maintained within your organisation, so if you do not wish to continue receiving these bulletins you should contact your local IT manager. If you do not know who that is, please send an email to auscert@auscert.org.au and we will forward your request to the appropriate person. NOTE: Third Party Rights This security bulletin is provided as a service to AusCERT's members. As AusCERT did not write the document quoted above, AusCERT has had no control over its content. The decision to follow or act on information or advice contained in this security bulletin is the responsibility of each user or organisation, and should be considered in accordance with your organisation's site policies and procedures. AusCERT takes no responsibility for consequences which may arise from following or acting on information or advice contained in this security bulletin. NOTE: This is only the original release of the security bulletin. It may not be updated when updates to the original are made. If downloading at a later date, it is recommended that the bulletin is retrieved directly from the author's website to ensure that the information is still current. Contact information for the authors of the original document is included in the Security Bulletin above. If you have any questions or need further information, please contact them directly. Previous advisories and external security bulletins can be retrieved from: http://www.auscert.org.au/render.html?cid=1980 =========================================================================== Australian Computer Emergency Response Team The University of Queensland Brisbane Qld 4072 Internet Email: auscert@auscert.org.au Facsimile: (07) 3365 7031 Telephone: (07) 3365 4417 (International: +61 7 3365 4417) AusCERT personnel answer during Queensland business hours which are GMT+10:00 (AEST). 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