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Test ID:
Category:Red Hat Local Security Checks
Title:RedHat Security Advisory RHSA-2007:0555

The remote host is missing updates announced in
advisory RHSA-2007:0555.

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

A flaw was found in the way pam_console set console device permissions. It
was possible for various console devices to retain ownership of the console
user after logging out, possibly leaking information to another local user.

A flaw was found in the way the PAM library wrote account names to the
audit subsystem. An attacker could inject strings containing parts of audit
messages which could possibly mislead or confuse audit log parsing tools.

As well, these updated packages fix the following bugs:

* truncated MD5-hashed passwords in /etc/shadow were treated as valid,
resulting in insecure and invalid passwords.

* the pam_namespace module did not convert context names to raw format and
did not unmount polyinstantiated directories in some cases. It also crashed
when an unknown user name was used in /etc/security/namespace.conf, the
pam_namespace configuration file.

* the pam_selinux module was not relabeling the controlling tty correctly,
and in some cases it did not send complete information about user role and
level change to the audit subsystem.

These updated packages add the following enhancements:

* pam_limits module now supports parsing additional config files placed
into the /etc/security/limits.d/ directory. These files are read after the
main configuration file.

* the modules pam_limits, pam_access, and pam_time now send a message to
the audit subsystem when a user is denied access based on the number of
login sessions, origin of user, and time of login.

* pam_unix module security properties were improved. Functionality in the
setuid helper binary, unix_chkpwd, which was not required for user
authentication, was moved to a new non-setuid helper binary, unix_update.

All users of PAM should upgrade to these updated packages, which resolve
these issues and add these enhancements.

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 : Medium

CVSS Score:

Cross-Ref: Common Vulnerability Exposure (CVE) ID: CVE-2007-1716
SGI Security Advisory: 20070602-01-P
Common Vulnerability Exposure (CVE) ID: CVE-2007-3102
BugTraq ID: 26097
CopyrightCopyright (c) 2007 E-Soft Inc.

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