[USN-2935-1] PAM vulnerabilities
marc.deslauriers at canonical.com
Wed Mar 16 14:22:24 UTC 2016
Ubuntu Security Notice USN-2935-1
March 16, 2016
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 15.10
- Ubuntu 14.04 LTS
- Ubuntu 12.04 LTS
Several security issues were fixed in PAM.
- pam: Pluggable Authentication Modules
It was discovered that the PAM pam_userdb module incorrectly used a
case-insensitive method when comparing hashed passwords. A local attacker
could possibly use this issue to make brute force attacks easier. This
issue only affected Ubuntu 12.04 LTS and Ubuntu 14.04 LTS. (CVE-2013-7041)
Sebastian Krahmer discovered that the PAM pam_timestamp module incorrectly
performed filtering. A local attacker could use this issue to create
arbitrary files, or possibly bypass authentication. This issue only
affected Ubuntu 12.04 LTS and Ubuntu 14.04 LTS. (CVE-2014-2583)
Sebastien Macke discovered that the PAM pam_unix module incorrectly handled
large passwords. A local attacker could possibly use this issue in certain
environments to enumerate usernames or cause a denial of service.
The problem can be corrected by updating your system to the following
Ubuntu 14.04 LTS:
Ubuntu 12.04 LTS:
In general, a standard system update will make all the necessary changes.
CVE-2013-7041, CVE-2014-2583, CVE-2015-3238
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