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CVE-2010-3431

Status Candidate

Overview

The privilege-dropping implementation in the (1) pam_env and (2) pam_mail modules in Linux-PAM (aka pam) 1.1.2 does not check the return value of the setfsuid system call, which might allow local users to obtain sensitive information by leveraging an unintended uid, as demonstrated by a symlink attack on the .pam_environment file in a user's home directory. NOTE: this vulnerability exists because of an incomplete fix for CVE-2010-3435.

Related Files

Gentoo Linux Security Advisory 201206-31
Posted Jun 25, 2012
Authored by Gentoo | Site security.gentoo.org

Gentoo Linux Security Advisory 201206-31 - Multiple vulnerabilities have been found in Linux-PAM, allowing local attackers to possibly gain escalated privileges, cause a Denial of Service, corrupt data, or obtain sensitive information. Versions less than 1.1.5 are affected.

tags | advisory, denial of service, local, vulnerability
systems | linux, gentoo
advisories | CVE-2010-3316, CVE-2010-3430, CVE-2010-3431, CVE-2010-3435, CVE-2010-3853, CVE-2010-4706, CVE-2010-4707, CVE-2010-4708, CVE-2011-3148, CVE-2011-3149
MD5 | e6620ba56b503fdc619693864274ef3b
Ubuntu Security Notice USN-1140-1
Posted May 30, 2011
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 1140-1 - Marcus Granado discovered that PAM incorrectly handled configuration files with non-ASCII usernames. A remote attacker could use this flaw to cause a denial of service, or possibly obtain login access with a different users username. This issue only affected Ubuntu 8.04 LTS. It was discovered that the PAM pam_xauth, pam_env and pam_mail modules incorrectly handled dropping privileges when performing operations. A local attacker could use this flaw to read certain arbitrary files, and access other sensitive information. It was discovered that the PAM pam_namespace module incorrectly cleaned the environment during execution of the namespace.init script. A local attacker could use this flaw to possibly gain privileges. It was discovered that the PAM pam_xauth module incorrectly handled certain failures. A local attacker could use this flaw to delete certain unintended files. It was discovered that the PAM pam_xauth module incorrectly verified certain file properties. A local attacker could use this flaw to cause a denial of service.

tags | advisory, remote, denial of service, arbitrary, local
systems | linux, ubuntu
advisories | CVE-2010-3435, CVE-2009-0887, CVE-2010-3316, CVE-2010-3430, CVE-2010-3431, CVE-2010-3435, CVE-2010-3853, CVE-2010-4706, CVE-2010-4707
MD5 | b7a67a9590379ccbe9dacf6e53bfb8ad
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