| Description: | Description:
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.
(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)
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.
Solution:
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
http://rhn.redhat.com/errata/RHSA-2010-0891.html
http://www.redhat.com/security/updates/classification/#moderate
Risk factor : High
CVSS Score:
6.9
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