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CVE-2015-3238

Status Candidate

Overview

The _unix_run_helper_binary function in the pam_unix module in Linux-PAM (aka pam) before 1.2.1, when unable to directly access passwords, allows local users to enumerate usernames or cause a denial of service (hang) via a large password.

Related Files

Gentoo Linux Security Advisory 201605-05
Posted May 31, 2016
Authored by Gentoo | Site security.gentoo.org

Gentoo Linux Security Advisory 201605-5 - Multiple vulnerabilities have been found in Linux-PAM, allowing remote attackers to bypass the auth process and cause Denial of Service. Versions less than 1.2.1 are affected.

tags | advisory, remote, denial of service, vulnerability
systems | linux, gentoo
advisories | CVE-2013-7041, CVE-2014-2583, CVE-2015-3238
MD5 | 50e1e89da52f32ad9ec5d0a867b9fa64
Ubuntu Security Notice USN-2935-3
Posted Mar 18, 2016
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 2935-3 - USN-2935-1 fixed vulnerabilities in PAM. The updates contained a packaging change that prevented upgrades in certain multiarch environments. USN-2935-2 intended to fix the problem but was incomplete for Ubuntu 12.04 LTS. This update fixes the problem in Ubuntu 12.04 LTS. Various other issues were also addressed.

tags | advisory, vulnerability
systems | linux, ubuntu
advisories | CVE-2013-7041, CVE-2014-2583, CVE-2015-3238
MD5 | 248d9ee502918942202419e130de1ef8
Ubuntu Security Notice USN-2935-2
Posted Mar 17, 2016
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 2935-2 - USN-2935-1 fixed vulnerabilities in PAM. The updates contained a packaging change that prevented upgrades in certain multiarch environments. This update fixes the problem. 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. 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. 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. Various other issues were also addressed.

tags | advisory, denial of service, arbitrary, local, vulnerability
systems | linux, ubuntu
advisories | CVE-2013-7041, CVE-2014-2583, CVE-2015-3238
MD5 | 07e8646d21c3d87d468b9636ec1fc2f8
Ubuntu Security Notice USN-2935-1
Posted Mar 16, 2016
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 2935-1 - 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. 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. Various other issues were also addressed.

tags | advisory, arbitrary, local
systems | linux, ubuntu
advisories | CVE-2013-7041, CVE-2014-2583, CVE-2015-3238
MD5 | ce271125441982f49cb9d96fe41b5855
Red Hat Security Advisory 2015-1640-01
Posted Aug 18, 2015
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2015-1640-01 - Pluggable Authentication Modules provide a system whereby administrators can set up authentication policies without having to recompile programs to handle authentication. It was discovered that the _unix_run_helper_binary() function of PAM's unix_pam module could write to a blocking pipe, possibly causing the function to become unresponsive. An attacker able to supply large passwords to the unix_pam module could use this flaw to enumerate valid user accounts, or cause a denial of service on the system.

tags | advisory, denial of service
systems | linux, redhat
advisories | CVE-2015-3238
MD5 | 84a5b750ab324a6cd7d8a5863d952743
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