Vulnerability Alert

Linux Kernel ext3_msg() Format String Vulnerability

 
Threat Type:CWE-134: Format String Vulnerability
IntelliShield ID:28656
Version:6
First Published:2013 March 21 17:25 GMT
Last Published:2013 July 17 20:24 GMT
Port: Not available
CVE:CVE-2013-1848
BugTraq ID:58600
Urgency:Unlikely Use
Credibility:Confirmed
Severity:Mild Damage
CVSS Base:4.3 CVSS Calculator
CVSS Version 2.0
CVSS Temporal:3.2
 
Version Summary:CentOS has released updated packages to address the Linux Kernel ext3_msg() format string vulnerability.
 
 
Description
The Linux Kernel contains a vulnerability that could allow a local attacker to gain elevated privileges on a targeted system.

The vulnerability is due to a format string error in the affected kernel versions while processing certain log messages. A local attacker could exploit this vulnerability by mounting crafted ext3 images on the affected system. If successful, the attacker could gain elevated privileges on the system and cause a denial of service (DoS) condition or execute arbitrary code on the system.

Kernel.org has confirmed this vulnerability and released an updated kernel version.
 
Warning Indicators
Linux Kernel versions prior to 3.8.4 are vulnerable.
 
IntelliShield Analysis
To exploit this vulnerability, the attacker must authenticate locally to the targeted system. This access requirement decreases the likelihood of a successful exploit.
 
Vendor Announcements
Kernel.org has released a summary of changes at the following link: Kernel 3.8.4 - Wed Mar 20 13:11:19 2013 -0700

Red Hat has released an official CVE statement and security advisories for bug 920783 at the following links: CVE-2013-1848, RHSA-2013-0829, RHSA-2013-0928, RHSA-2013-1026, and RHSA-2013-1051
 
Impact
A local attacker could exploit this vulnerability to gain elevated privileges on a targeted system. The attacker could use the privileges to execute arbitrary code or cause a DoS condition on the system.
 
Technical Information
The vulnerability is due to a format string error in the ext3_blkdev_get() and get_sb_block() functions in the fs/ext3/super.c source file used by the affected kernel versions.

A local attacker could exploit this vulnerability by mounting a crafted ext3 image on the targeted system. If successful, the attacker could gain elevated privileges and cause a DoS condition or execute arbitrary code on the system.
 
Safeguards
Administrators are advised to apply the appropriate updates.

Administrators may consider using IP-based access control lists (ACLs) to allow only trusted systems to access the affected systems.

Administrators are advised to monitor affected systems.
 
Patches/Software
Kernel.org has released an updated version at the following link: Linux Kernel 3.8.4

CentOS packages can be updated using the up2date or yum command.

Red Hat has released updated software for registered subscribers at the following link: Red Hat Network. Red Hat packages can be updated on Red Hat Enterprise Linux versions 5 and later using the yum tool.
 
Alert History
 

Version 5, July 16, 2013, 8:17 PM: Red Hat has released an additional security advisory and updated packages to address the Linux Kernel ext3_msg() format string vulnerability.

Version 4, July 10, 2013, 1:25 PM: Red Hat has released an additional security advisory and updated packages to address the Linux Kernel ext3_msg() format string vulnerability.

Version 3, June 12, 2013, 2:49 PM: Red Hat has released an additional security advisory and updated packages to address the Linux Kernel ext3_msg() format string vulnerability.

Version 2, May 21, 2013, 5:02 PM: Kernel.org has released changelog and updated packages to address the Linux Kernel ext3_msg() format string vulnerability. Red Hat has also released a security advisory and updated packages to address this vulnerability.

Version 1, March 21, 2013, 5:25 PM: Linux Kernel contains a vulnerability that could allow a local attacker to gain elevated privileges on a targeted system. Updates are not available.


Product Sets
 
The security vulnerability applies to the following combinations of products.

Primary Products:
Linus TorvaldsLinux Kernel 3.8 .1, .2, .3

Associated Products:
CentOS ProjectCentOS 6 .0 i386, .0 x86_64, .1 i386, .1 x86_64, .2 i386, .2 x86_64
Red Hat, Inc.Red Hat Enterprise Linux Server AUS 6.2 IA-32, x86_64 | 6.4 IA-32, x86_64
Red Hat, Inc.Red Hat Enterprise Linux Desktop 6 IA-32, x86_64
Red Hat, Inc.Red Hat Enterprise Linux HPC Node 6 x86_64
Red Hat, Inc.Red Hat Enterprise Linux Server 6 IA-32, PPC, PPC 64, s390x, x86_64
Red Hat, Inc.Red Hat Enterprise Linux Server EUS 6.2.z IA-32, PPC64, s390x, x86_64 | 6.3.z IA-32, PPC, PPC64, s390x, x86_64 | 6.4z IA-32, x86_64, PPC64, s390x
Red Hat, Inc.Red Hat Enterprise Linux Workstation 6 IA-32, x86_64
Red Hat, Inc.Red Hat Enterprise MRG for Enterprise Linux 2 x86_64




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