Scientific Linux 6.x: Moderate Pam Update Addressing CVE-2010-3316

Date: Thu, 3 Mar 2011 15:51:49 -0600
Reply-To: Troy Dawson 
Sender: Security Errata for Scientific Linux
 
From: Troy Dawson 
Subject: Security ERRATA Moderate: pam on SL6.x i386/x86_64
Comments: To: "This email address is being protected from spambots. You need JavaScript enabled to view it."
 

Synopsis:	Moderate: pam security update
Issue date:	2010-11-16
CVE Names:	CVE-2010-3316 CVE-2010-3435 CVE-2010-3853

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. (CVE-2010-3435)

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)

SL 6.x

 SRPMS:
pam-1.1.1-4.el6_0.1.src.rpm
 i386:
pam-1.1.1-4.el6_0.1.i686.rpm
pam-devel-1.1.1-4.el6_0.1.i686.rpm
 x86_64:
pam-1.1.1-4.el6_0.1.i686.rpm
pam-1.1.1-4.el6_0.1.x86_64.rpm
pam-devel-1.1.1-4.el6_0.1.i686.rpm
pam-devel-1.1.1-4.el6_0.1.x86_64.rpm

-Connie Sieh
-Troy Dawson