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Scientific Linux Security Update : sudo on SL5.x i386/x86_64 (20130930)
medium Nessus Plugin ID 70392
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Synopsis
The remote Scientific Linux host is missing one or more security updates.Description
A flaw was found in the way sudo handled time stamp files. An attacker able to run code as a local user and with the ability to control the system clock could possibly gain additional privileges by running commands that the victim user was allowed to run via sudo, without knowing the victim's password. (CVE-2013-1775)It was found that sudo did not properly validate the controlling terminal device when the tty_tickets option was enabled in the /etc/sudoers file. An attacker able to run code as a local user could possibly gain additional privileges by running commands that the victim user was allowed to run via sudo, without knowing the victim's password. (CVE-2013-1776, CVE-2013-2776)
This update also fixes the following bugs :
- Due to a bug in the cycle detection algorithm of the visudo utility, visudo incorrectly evaluated certain alias definitions in the /etc/sudoers file as cycles.
Consequently, a warning message about undefined aliases appeared. This bug has been fixed, /etc/sudoers is now parsed correctly by visudo and the warning message no longer appears.
- Previously, the 'sudo -l' command did not parse the /etc/sudoers file correctly if it contained an Active Directory (AD) group. The file was parsed only up to the first AD group information and then the parsing failed with the following message :
sudo: unable to cache group ADDOM\admingroup, already exists
With this update, the underlying code has been modified and 'sudo -l' now parses /etc/sudoers containing AD groups correctly.
- Previously, the sudo utility did not escape the backslash characters contained in user names properly.
Consequently, if a system used sudo integrated with LDAP or Active Directory (AD) as the primary authentication mechanism, users were not able to authenticate on that system. With this update, sudo has been modified to process LDAP and AD names correctly and the authentication process now works as expected.
- Prior to this update, the 'visudo -s (strict)' command incorrectly parsed certain alias definitions.
Consequently, an error message was issued. The bug has been fixed, and parsing errors no longer occur when using 'visudo - -s'.
Solution
Update the affected sudo and / or sudo-debuginfo packages.See Also
Plugin Details
Severity: Medium
ID: 70392
File Name: sl_20130930_sudo_on_SL5_x.nasl
Version: 1.6
Type: local
Agent: unix
Published: 10/11/2013
Updated: 1/14/2021
Supported Sensors: Nessus Agent, Nessus
Risk Information
VPR
Risk Factor: High
Score: 8.9
CVSS v2
Risk Factor: Medium
Base Score: 6.9
Vector: CVSS2#AV:L/AC:M/Au:N/C:C/I:C/A:C
Vulnerability Information
CPE: p-cpe:/a:fermilab:scientific_linux:sudo, p-cpe:/a:fermilab:scientific_linux:sudo-debuginfo, x-cpe:/o:fermilab:scientific_linux
Required KB Items: Host/local_checks_enabled, Host/RedHat/release, Host/RedHat/rpm-list, Host/cpu
Exploit Available: true
Exploit Ease: Exploits are available
Patch Publication Date: 9/30/2013
Vulnerability Publication Date: 3/5/2013
Exploitable With
CANVAS (CANVAS)
Metasploit (Mac OS X Sudo Password Bypass)