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-----BEGIN PGP SIGNED MESSAGE----- =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2003.0089 -- RHSA-2003:035-10 Updated PAM packages fix bug in pam_xauth module 14 February 2003 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: PAM Vendor: Red Hat Operating System: Red Hat Linux 7.1 Red Hat Linux 7.2 Red Hat Linux 7.3 Red Hat Linux 8.0 Linux Platform: i386 IA-64 Impact: Root Compromise Access Required: Existing Account Comment: CVE Id: CAN-2002-1160 - --------------------------BEGIN INCLUDED TEXT-------------------- - --------------------------------------------------------------------- Red Hat, Inc. Red Hat Security Advisory Synopsis: Updated PAM packages fix bug in pam_xauth module Advisory ID: RHSA-2003:035-10 Issue date: 2003-02-07 Updated on: 2003-02-12 Product: Red Hat Linux Keywords: pam_xauth root cookies Cross references: RHSA-2003:028 Obsoletes: CVE Names: CAN-2002-1160 - --------------------------------------------------------------------- 1. Topic: Updated PAM packages are now available for Red Hat Linux 7.1, 7.2, 7.3, and 8.0. These packages correct a bug in pam_xauth's handling of authorization data for the root user. 2. Relevant releases/architectures: Red Hat Linux 7.1 - i386 Red Hat Linux 7.2 - i386, ia64 Red Hat Linux 7.3 - i386 Red Hat Linux 8.0 - i386 3. Problem description: The pam_xauth module is used to forward xauth information from user to user in applications such as 'su'. Andreas Beck discovered that versions of pam_xauth supplied with Red Hat Linux since version 7.1 would forward authorization information from the root account to unprivileged users. This could be used by a local attacker to gain access to an administrator's X session. In order to exploit this vulnerability, the attacker would have to get the administrator, as root, to use su to the account belonging to the attacker. Users of pam_xauth are advised to upgrade to these errata packages, which contain a patch that adds ACL (access control list) functionality to pam_xauth and disallows root forwarding by default. Versions of pam_xauth included in Red Hat Linux 7 and earlier disabled passing of credentials from the root account to unprivileged users by default and are not affected by this issue. Thanks to Andreas Beck for reporting this issue. 4. Solution: Before applying this update, make sure all previously released errata relevant to your system have been applied. To update all RPMs for your particular architecture, run: rpm -Fvh [filenames] where [filenames] is a list of the RPMs you wish to upgrade. Only those RPMs which are currently installed will be updated. Those RPMs which are not installed but included in the list will not be updated. Note that you can also use wildcards (*.rpm) if your current directory *only* contains the desired RPMs. Please note that this update is also available via Red Hat Network. Many people find this an easier way to apply updates. To use Red Hat Network, launch the Red Hat Update Agent with the following command: up2date This will start an interactive process that will result in the appropriate RPMs being upgraded on your system. 5. RPMs required: Red Hat Linux 7.1: SRPMS: ftp://updates.redhat.com/7.1/en/os/SRPMS/pam-0.75-46.7.1.src.rpm i386: ftp://updates.redhat.com/7.1/en/os/i386/pam-0.75-46.7.1.i386.rpm ftp://updates.redhat.com/7.1/en/os/i386/pam-devel-0.75-46.7.1.i386.rpm Red Hat Linux 7.2: SRPMS: ftp://updates.redhat.com/7.2/en/os/SRPMS/pam-0.75-46.7.2.src.rpm i386: ftp://updates.redhat.com/7.2/en/os/i386/pam-0.75-46.7.2.i386.rpm ftp://updates.redhat.com/7.2/en/os/i386/pam-devel-0.75-46.7.2.i386.rpm ia64: ftp://updates.redhat.com/7.2/en/os/ia64/pam-0.75-46.7.2.ia64.rpm ftp://updates.redhat.com/7.2/en/os/ia64/pam-devel-0.75-46.7.2.ia64.rpm Red Hat Linux 7.3: SRPMS: ftp://updates.redhat.com/7.3/en/os/SRPMS/pam-0.75-46.7.3.src.rpm i386: ftp://updates.redhat.com/7.3/en/os/i386/pam-0.75-46.7.3.i386.rpm ftp://updates.redhat.com/7.3/en/os/i386/pam-devel-0.75-46.7.3.i386.rpm Red Hat Linux 8.0: SRPMS: ftp://updates.redhat.com/8.0/en/os/SRPMS/pam-0.75-46.8.0.src.rpm i386: ftp://updates.redhat.com/8.0/en/os/i386/pam-0.75-46.8.0.i386.rpm ftp://updates.redhat.com/8.0/en/os/i386/pam-devel-0.75-46.8.0.i386.rpm 6. Verification: MD5 sum Package Name - -------------------------------------------------------------------------- 4a869dd0efd82fb9f098cc4284263aeb 7.1/en/os/SRPMS/pam-0.75-46.7.1.src.rpm 2ee6c4e7c9c59efdf3e31c8d9482a30a 7.1/en/os/i386/pam-0.75-46.7.1.i386.rpm 0d8f6cb6d0f293cb174f3e376c21eb1d 7.1/en/os/i386/pam-devel-0.75-46.7.1.i386.rpm fcbe7194fc12466d4532b213373c3ce6 7.2/en/os/SRPMS/pam-0.75-46.7.2.src.rpm 7d16c011e4f74e8e02bb8c193506186d 7.2/en/os/i386/pam-0.75-46.7.2.i386.rpm 0919b62d8d7531883d6e01f5ff3a51b6 7.2/en/os/i386/pam-devel-0.75-46.7.2.i386.rpm e653e3ff25eb958570b411d201b5106e 7.2/en/os/ia64/pam-0.75-46.7.2.ia64.rpm 8f4d0dc64cdbded20c46a38460e6affe 7.2/en/os/ia64/pam-devel-0.75-46.7.2.ia64.rpm 99751631043fbe42f98f8598e74e6d4b 7.3/en/os/SRPMS/pam-0.75-46.7.3.src.rpm 8ea6d868c28c22d629d2059f1ad72f1b 7.3/en/os/i386/pam-0.75-46.7.3.i386.rpm 9fef754632838504c0590ba30203a925 7.3/en/os/i386/pam-devel-0.75-46.7.3.i386.rpm 1b74821ca4fd0b7a9919c3b0fdf3dbb3 8.0/en/os/SRPMS/pam-0.75-46.8.0.src.rpm 25ebcb39f56c98cc064c34b2d048ed35 8.0/en/os/i386/pam-0.75-46.8.0.i386.rpm f6412156d54a4021a3200eb7d7ff79c0 8.0/en/os/i386/pam-devel-0.75-46.8.0.i386.rpm These packages are GPG signed by Red Hat, Inc. for security. Our key is available at http://www.redhat.com/about/contact/pgpkey.html You can verify each package with the following command: rpm --checksig -v <filename> If you only wish to verify that each package has not been corrupted or tampered with, examine only the md5sum with the following command: md5sum <filename> 7. References: http://www.redhat.com/support/wpapers/redhat/newpam/tinkering.html http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2002-1160 8. Contact: The Red Hat security contact is <security@redhat.com>. More contact details at http://www.redhat.com/solutions/security/news/contact.html Copyright 2003 Red Hat, Inc. - --------------------------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. 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Previous advisories and external security bulletins can be retrieved from: http://www.auscert.org.au/render.html?cid=1980 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 member emergencies only. -----BEGIN PGP SIGNATURE----- Version: 2.6.3i Charset: noconv Comment: http://www.auscert.org.au/render.html?it=1967 iQCVAwUBPk0jsCh9+71yA2DNAQH2ggP/YXs9wVYSznr4beipqXlu7nyLqOl32Nvs Nqe0KCgBK1PUy+FZqxFMOpmqWYhma+u7PDVqHJJrbmEQyP62p3ln4rPFwWvuUtbj xmaxzdyrLkvG+eCq8TEs25KQz2ue5ImPwWnKGaDMn6Xrg1AB3KdJMb2TXtREXDez dhzBp+RZ6Gc= =dq5v -----END PGP SIGNATURE-----