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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2007.0343 -- [FreeBSD] Heap overflow in file(1) 24 May 2007 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: file Publisher: FreeBSD Operating System: FreeBSD Impact: Execute Arbitrary Code/Commands Access: Remote/Unauthenticated CVE Names: CVE-2007-1536 Ref: ESB-2007.0194 Original Bulletin: ftp://ftp.freebsd.org/pub/FreeBSD/CERT/advisories/FreeBSD-SA-07:04.file.asc - --------------------------BEGIN INCLUDED TEXT-------------------- - -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 ============================================================================= FreeBSD-SA-07:04.file Security Advisory The FreeBSD Project Topic: Heap overflow in file(1) Category: contrib Module: file Announced: 2007-05-23 Affects: All FreeBSD releases. Corrected: 2007-05-23 16:12:51 UTC (RELENG_6, 6.2-STABLE) 2007-05-23 16:13:07 UTC (RELENG_6_2, 6.2-RELEASE-p5) 2007-05-23 16:13:20 UTC (RELENG_6_1, 6.1-RELEASE-p17) 2007-05-23 16:12:10 UTC (RELENG_5, 5.5-STABLE) 2007-05-23 16:12:35 UTC (RELENG_5_5, 5.5-RELEASE-p13) CVE Name: CVE-2007-1536 For general information regarding FreeBSD Security Advisories, including descriptions of the fields above, security branches, and the following sections, please visit <URL:http://security.FreeBSD.org/>. I. Background The file(1) utility attempts to classify file system objects based on filesystem, magic number and language tests. The libmagic(3) library provides most of the functionality of file(1) and may be used by other applications. II. Problem Description When writing data into a buffer in the file_printf function, the length of the unused portion of the buffer is not correctly tracked, resulting in a buffer overflow when processing certain files. III. Impact An attacker who can cause file(1) to be run on a maliciously constructed input can cause file(1) to crash. It may be possible for such an attacker to execute arbitrary code with the privileges of the user running file(1). The above also applies to any other applications using the libmagic(3) library. IV. Workaround No workaround is available, but systems where file(1) and other libmagic(3)-using applications are never run on untrusted input are not vulnerable. V. Solution Perform one of the following: 1) Upgrade your vulnerable system to 5-STABLE, or 6-STABLE, or to the RELENG_6_2, RELENG_6_1, or RELENG_5_5 security branch dated after the correction date. 2) To patch your present system: The following patches have been verified to apply to FreeBSD 5.5, 6.1, and 6.2 systems. a) Download the relevant patch from the location below, and verify the detached PGP signature using your PGP utility. [FreeBSD 5.5] # fetch http://security.FreeBSD.org/patches/SA-07:04/file5.patch # fetch http://security.FreeBSD.org/patches/SA-07:04/file5.patch.asc [FreeBSD 6.1 and 6.2] # fetch http://security.FreeBSD.org/patches/SA-07:04/file6.patch # fetch http://security.FreeBSD.org/patches/SA-07:04/file6.patch.asc b) Execute the following commands as root: # cd /usr/src # patch < /path/to/patch # cd /usr/src/lib/libmagic # make obj && make depend && make && make install VI. Correction details The following list contains the revision numbers of each file that was corrected in FreeBSD. Branch Revision Path - - ------------------------------------------------------------------------- RELENG_5 src/contrib/file/file.h 1.1.1.7.2.1 src/contrib/file/funcs.c 1.1.1.1.2.1 src/contrib/file/magic.c 1.1.1.1.2.1 RELENG_5_5 src/UPDATING 1.342.2.35.2.13 src/sys/conf/newvers.sh 1.62.2.21.2.15 src/contrib/file/file.h 1.1.1.7.8.1 src/contrib/file/funcs.c 1.1.1.1.8.1 src/contrib/file/magic.c 1.1.1.1.8.1 RELENG_6 src/contrib/file/file.h 1.1.1.8.2.1 src/contrib/file/funcs.c 1.1.1.2.2.1 src/contrib/file/magic.c 1.1.1.2.2.1 RELENG_6_2 src/UPDATING 1.416.2.29.2.8 src/sys/conf/newvers.sh 1.69.2.13.2.8 src/contrib/file/file.h 1.1.1.8.8.1 src/contrib/file/funcs.c 1.1.1.2.8.1 src/contrib/file/magic.c 1.1.1.2.8.1 RELENG_6_1 src/UPDATING 1.416.2.22.2.19 src/sys/conf/newvers.sh 1.69.2.11.2.19 src/contrib/file/file.h 1.1.1.8.6.1 src/contrib/file/funcs.c 1.1.1.2.6.1 src/contrib/file/magic.c 1.1.1.2.6.1 - - ------------------------------------------------------------------------- VII. References http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-1536 The latest revision of this advisory is available at http://security.FreeBSD.org/advisories/FreeBSD-SA-07:04.file.asc - -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.7 (FreeBSD) iD8DBQFGVGjhFdaIBMps37IRAgogAJ9o/0yCxtRi527rgvhg/BoC/AvEsQCfcwMX ABl7JIb1XiY6QKWQ6UfwlGA= =meQ0 - -----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 If you believe that your computer system has been compromised or attacked in any way, we encourage you to let us know by completing the secure National IT Incident Reporting Form at: http://www.auscert.org.au/render.html?it=3192 =========================================================================== 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). On call after hours for member emergencies only. =========================================================================== -----BEGIN PGP SIGNATURE----- Comment: http://www.auscert.org.au/render.html?it=1967 iQCVAwUBRlT2VCh9+71yA2DNAQKZLgQAkSlH2GXvjokICqtSCRE/H9DNxAoyUv4z 7eFkRZhgxUFGvzG1aB0HIyeqBNxszLgY6DqTZ8lW91ADZ/zY1P8sFJMHxzlz/+NI 2eRgvBB2JZW8wk5cJy1aqyeUgAFUGchVsGGNhVlYqj+L0gE7DpwqEZAlG6gv4jEy j4MTdddDLLg= =8Nt8 -----END PGP SIGNATURE-----