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Scientific Linux Security Update : sudo on SL6.x i386/x86_64 (20131121)
medium Nessus Plugin ID 71300
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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-2013-2776, CVE-2013-2777)
This update also fixes the following bugs :
- Previously, sudo did not support netgroup filtering for sources from the System Security Services Daemon (SSSD).
Consequently, SSSD rules were applied to all users even when they did not belong to the specified netgroup. With this update, netgroup filtering for SSSD sources has been implemented. As a result, rules with a netgroup specification are applied only to users that are part of the netgroup.
- When the sudo utility set up the environment in which it ran a command, it reset the value of the RLIMIT_NPROC resource limit to the parent's value of this limit if both the soft (current) and hard (maximum) values of RLIMIT_NPROC were not limited. An upstream patch has been provided to address this bug and RLIMIT_NPROC can now be set to 'unlimited'.
- Due to the refactoring of the sudo code by upstream, the SUDO_USER variable that stores the name of the user running the sudo command was not logged to the /var/log/secure file as before. Consequently, user name 'root' was always recorded instead of the real user name. With this update, the previous behavior of sudo has been restored. As a result, the expected user name is now written to /var/log/secure.
- Due to an error in a loop condition in sudo's rule listing code, a buffer overflow could have occurred in certain cases. This condition has been fixed and the buffer overflow no longer occurs.
In addition, this update adds the following enhancements :
- With this update, sudo has been modified to send debug messages about netgroup matching to the debug log. These messages should provide better understanding of how sudo matches netgroup database records with values from the running system and what the values are exactly.
- With this update, sudo has been modified to accept the ipa_hostname value from the /etc/sssd/sssd.conf configuration file when matching netgroups.
Solution
Update the affected sudo, sudo-debuginfo and / or sudo-devel packages.See Also
Plugin Details
Severity: Medium
ID: 71300
File Name: sl_20131121_sudo_on_SL6_x.nasl
Version: 1.7
Type: local
Agent: unix
Published: 12/10/2013
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, p-cpe:/a:fermilab:scientific_linux:sudo-devel, 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: 11/21/2013
Vulnerability Publication Date: 3/5/2013
Exploitable With
CANVAS (CANVAS)
Metasploit (Mac OS X Sudo Password Bypass)