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-----BEGIN PGP SIGNED MESSAGE----- =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2002.005 -- FreeBSD-SA-02:01.pkg_add Directory permission vulnerability in pkg_add 8 January 2002 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: pkg_add Vendor: FreeBSD Operating System: FreeBSD BSD UNIX Impact: Increased Privileges Modify Arbitrary Files Access Required: Existing Account - --------------------------BEGIN INCLUDED TEXT-------------------- - -----BEGIN PGP SIGNED MESSAGE----- ============================================================================= FreeBSD-SA-02:01 Security Advisory FreeBSD, Inc. Topic: Directory permission vulnerability in pkg_add Category: core Module: pkg_install Announced: 2002-01-04 Credits: The Anarcat <anarcat@anarcat.dyndns.org> Affects: All versions of FreeBSD prior to the correction date. Corrected: 2001/11/22 17:40:36 UTC (4.4-STABLE aka RELENG_4) 2001/12/07 20:58:46 UTC (4.4-RELEASEp1 aka RELENG_4_4) 2001/12/07 20:57:19 UTC (4.3-RELEASEp21 aka RELENG_4_3) FreeBSD only: NO I. Background pkg_add is a utility program used to install software package distributions on FreeBSD systems. II. Problem Description pkg_add extracts the contents of the package to a temporary directory, then moves files from the temporary directory to their ultimate destination on the system. The temporary directory used in the extraction was created with world-writable permissions, allowing arbitrary users to examine the contents of the package as it was being extracted. This might allow users to attack world-writable parts of the package during installation. III. Impact A local attacker may be able to modify the package contents and potentially elevate privileges or otherwise compromise the system. There are no known exploits as of the date of this advisory. IV. Workaround 1) Remove or discontinue use of the pkg_add binary until it has been upgraded. 2) When running pkg_add, create a secure temporary directory (such as /var/tmp/inst) and secure the directory permissions (chmod 700 /var/tmp/inst). Set the TMPDIR environment variable to this directory before running pkg_add. V. Solution 1) Upgrade your vulnerable FreeBSD system to 4.4-STABLE, or the RELENG_4_4 or RELENG_4_3 security branches dated after the respective correction dates. 2) FreeBSD 4.x systems prior to the correction date: The following patch has been verified to apply to FreeBSD 4.3-RELEASE, 4.4-RELEASE, and 4-STABLE dated prior to the correction date. This patch may or may not apply to older, unsupported releases of FreeBSD. Download the patch and the detached PGP signature from the following locations, and verify the signature using your PGP utility. ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-02:01/pkg_add.patch ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-02:01/pkg_add.patch.asc Execute the following commands as root: # cd /usr/src # patch -p < /path/to/patch # cd /usr/src/usr.sbin/pkg_install # make depend && make all install VI. Correction details The following list contains the $FreeBSD$ revision numbers of each file that was corrected in the FreeBSD source Path Revision Branch - - ------------------------------------------------------------------------- src/usr.sbin/pkg_install/lib/pen.c HEAD 1.37 RELENG_4 1.31.2.6 RELENG_4_4 1.31.2.2.2.1 RELENG_4_3 1.31.2.1.2.1 - - ------------------------------------------------------------------------- VII. References <URL:http://www.FreeBSD.org/cgi/query-pr.cgi?pr=32172> - -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.0.6 (FreeBSD) Comment: For info see http://www.gnupg.org iQCVAwUBPDZOBlUuHi5z0oilAQEPwwP/ZKTT+30/iNKFVEpxjIr1IgW/YkMI3ViG G3C12reQQ/QcfGhdxjJesMqeHDhEf2onmZ7ftYRu2Wpg7BC5KAH5rbQ5vDgdVEI0 ym5zPNOR9BgXVuZ9WZ1M6SizHZwngfn/JHjMltd1xcdCwJ93iVq+/NQg1bB5u7op MPFLhNSwNks= =cT/W - -----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. 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 use any or all of this information is the responsibility of each user or organisation, and should be done so in accordance with site policies and procedures. 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 original authors 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/Information/advisories.html If you believe that your system has been compromised, contact AusCERT or your representative in FIRST (Forum of Incident Response and Security Teams). 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 emergencies. -----BEGIN PGP SIGNATURE----- Version: 2.6.3i Charset: noconv Comment: ftp://ftp.auscert.org.au/pub/auscert/AUSCERT_PGP.key iQCVAwUBPDrUySh9+71yA2DNAQEDjwP/fysRyVgTC/1/UMf2TXZhPNrTJkJgGKtp vX9+Jli70ccAca70BgwdMpSyaq75FsuQvC9CP23xP3xBeS5t1AXi01Pc6mJPi5pd MPi0Rlz0zFkEzjE+niEVpw8oD1WBJJEcR2+UP3EiPmk78+VdnYhjptRshmgSjlgs QN0z7g/N/Bk= =sQNU -----END PGP SIGNATURE-----