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Test ID:
Category:Red Hat Local Security Checks
Title:RedHat Security Advisory RHSA-2010:0891
The remote host is missing updates announced in
advisory RHSA-2010:0891.

Pluggable Authentication Modules (PAM) provide a system whereby
administrators can set up authentication policies without having to
recompile programs that handle authentication.

It was discovered that the pam_namespace module executed the external
script namespace.init with an unchanged environment inherited from an
application calling PAM. In cases where such an environment was untrusted
(for example, when pam_namespace was configured for setuid applications
such as su or sudo), a local, unprivileged user could possibly use this
flaw to escalate their privileges. (CVE-2010-3853)

It was discovered that the pam_env and pam_mail modules used root
privileges while accessing user's files. A local, unprivileged user could
use this flaw to obtain information, from the lines that have the KEY=VALUE
format expected by pam_env, from an arbitrary file. Also, in certain
configurations, a local, unprivileged user using a service for which the
pam_mail module was configured for, could use this flaw to obtain limited
information about files or directories that they do not have access to.

Note: As part of the fix for CVE-2010-3435, this update changes the default
value of pam_env's configuration option user_readenv to 0, causing the
module to not read user's ~
/.pam_environment configuration file by default,
as reading it may introduce unexpected changes to the environment of the
service using PAM, or PAM modules consulted after pam_env.

It was discovered that the pam_xauth module did not verify the return
values of the setuid() and setgid() system calls. A local, unprivileged
user could use this flaw to execute the xauth command with root privileges
and make it read an arbitrary input file. (CVE-2010-3316)

Red Hat would like to thank Sebastian Krahmer of the SuSE Security Team for
reporting the CVE-2010-3435 issue.

All pam users should upgrade to these updated packages, which contain
backported patches to correct these issues.

Please note that this update is available via
Red Hat Network. To use Red Hat Network, launch the Red
Hat Update Agent with the following command: up2date

Risk factor : High

CVSS Score:

Cross-Ref: Common Vulnerability Exposure (CVE) ID: CVE-2010-3316
Bugtraq: 20110308 VMSA-2011-0004 VMware ESX/ESXi SLPD denial of service vulnerability and ESX third party updates for Service Console packages bind, pam, and rpm. (Google Search)
Common Vulnerability Exposure (CVE) ID: CVE-2010-3435
Common Vulnerability Exposure (CVE) ID: CVE-2010-3853
CopyrightCopyright (c) 2011 E-Soft Inc.

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