GNU C Library ld.so privilege escalation

gnuclibrary-ldso-priv-esc (66820) The risk level is classified as HighHigh Risk

Description:

GNU C Library could allow a local attacker to gain elevated privileges on the system, caused by the expansion of the $ORIGIN dynamic string token when RPATH is composed entirely of this token by ld.so. By creating a hard link to a setuid or setgid program with this RPATH value, a local attacker could exploit this vulnerability to execute arbitrary code on the system with elevated privileges.

*CVSS:

Base Score: 4.6
  Access Vector: Local
  Access Complexity: Low
  Authentication: None
  Confidentiality Impact: Partial
  Integrity Impact: Partial
  Availability Impact: Partial
 
Temporal Score: 3.4
  Exploitability: Unproven
  Remediation Level: Official-Fix
  Report Confidence: Confirmed

Consequences:

Gain Privileges

Remedy:

Apply the appropriate patch for your system. See References.

References:

  • GNU C Library Web page: GNC C Library - GNU Project - Free Software Foundation (FSF).
  • Red Hat Bugzilla ¿ Bug 667974: (CVE-2011-0536) CVE-2011-0536 glibc: CVE-2010-3847 fix causes linker to search CWD when running privileged program with $ORIGIN in R*PATH.
  • CVE-2011-1658: ld.so in the GNU C Library (aka glibc or libc6) 2.13 and earlier expands the $ORIGIN dynamic string token when RPATH is composed entirely of this token, which might allow local users to gain privileges by creating a hard link in an arbitrary directory to a (1) setuid or (2) setgid program with this RPATH value, and then executing the program with a crafted value for the LD_PRELOAD environment variable, a different vulnerability than CVE-2010-3847 and CVE-2011-0536. NOTE: it is not expected that any standard operating-system distribution would ship an applicable setuid or setgid program.
  • RHSA-2011-0412: Important: glibc security update
  • RHSA-2011-0413: Important: glibc security update
  • SA46397: VMware ESX / ESXi Server Multiple Vulnerabilities

Platforms Affected:

  • GNU Glibc 1.00
  • GNU Glibc 1.01
  • GNU Glibc 1.02
  • GNU Glibc 1.03
  • GNU Glibc 1.04
  • GNU Glibc 1.05
  • GNU Glibc 1.06
  • GNU Glibc 1.07
  • GNU Glibc 1.08
  • GNU Glibc 1.09
  • GNU Glibc 1.09.1
  • GNU glibc 2.0
  • GNU glibc 2.0.1
  • GNU glibc 2.0.2
  • GNU glibc 2.0.3
  • GNU glibc 2.0.4
  • GNU glibc 2.0.5
  • GNU glibc 2.0.6
  • GNU glibc 2.1
  • GNU glibc 2.1.1
  • GNU glibc 2.1.1.6
  • GNU glibc 2.1.2
  • GNU glibc 2.1.3
  • GNU Glibc 2.1.3.10
  • GNU glibc 2.1.9
  • GNU Glibc 2.10
  • GNU Glibc 2.10.1
  • GNU Glibc 2.10.2
  • GNU Glibc 2.11
  • GNU Glibc 2.11.1
  • GNU Glibc 2.11.2
  • GNU Glibc 2.11.3
  • GNU Glibc 2.12.0
  • GNU Glibc 2.12.1
  • GNU Glibc 2.12.2
  • GNU Glibc 2.13
  • GNU glibc 2.2
  • GNU glibc 2.2.1
  • GNU glibc 2.2.2
  • GNU glibc 2.2.3
  • GNU glibc 2.2.4
  • GNU glibc 2.2.5
  • GNU glibc 2.3
  • GNU glibc 2.3.1
  • GNU glibc 2.3.10
  • GNU glibc 2.3.2
  • GNU glibc 2.3.3
  • GNU glibc 2.3.4
  • GNU Glibc 2.3.5
  • GNU Glibc 2.3.6
  • GNU Glibc 2.4
  • GNU Glibc 2.5
  • GNU Glibc 2.5.1
  • GNU Glibc 2.6
  • GNU Glibc 2.6.1
  • GNU Glibc 2.7
  • GNU Glibc 2.8
  • GNU Glibc 2.9
  • RedHat Enterprise Linux 5
  • RedHat Enterprise Linux 5 Client
  • RedHat Enterprise Linux 6 Server
  • RedHat Enterprise Linux 6 Workstation
  • RedHat Enterprise Linux Desktop 6
  • RedHat Enterprise Linux EUS 5.6.z
  • RedHat Enterprise Linux HPC Node 6
  • RedHat Enterprise Linux Long Life 5.6
  • RedHat Enterprise Linux Server EUS 6.0.z

Reported:

Apr 12, 2011

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