Linux Kernel keyctl_session_to_parent denial of service

linux-kernel-keyctl-dos (61557) The risk level is classified as MediumMedium Risk

Description:

The Linux Kernel is vulnerable to a denial of service, caused by NULL pointer dereference in the keyctl_session_to_parent() function. A remote attacker could exploit this vulnerability to cause the a kernel oops.

*CVSS:

Base Score: 7.8
  Access Vector: Network
  Access Complexity: Low
  Authentication: None
  Confidentiality Impact: None
  Integrity Impact: None
  Availability Impact: Complete
 
Temporal Score: 6
  Exploitability: Unproven
  Remediation Level: Temporary-Fix
  Report Confidence: Confirmed

Consequences:

Denial of Service

Remedy:

Refer to Red Hat Bugzilla Bug 627440 for patch, upgrade or suggested workaround information. See References.

References:

  • Red Hat Bugzilla Bug 627440: CVE-2010-2960 keyctl_session_to_parent NULL deref system crash.
  • BID-42932: Linux Kernel 'keyctl_session_to_parent()' Null Pointer Dereference Denial of Service Vulnerability
  • CVE-2010-2960: The keyctl_session_to_parent function in security/keys/keyctl.c in the Linux kernel 2.6.35.4 and earlier expects that a certain parent session keyring exists, which allows local users to cause a denial of service (NULL pointer dereference and system crash) or possibly have unspecified other impact via a KEYCTL_SESSION_TO_PARENT argument to the keyctl function.
  • OSVDB ID: 67775: Linux Kernel security/keys/keyctl.c keyctl_session_to_parent() Function NULL Dereference DoS
  • OSVDB ID: 72986: Linux Kernel security/keys/process_keys.c key_replace_session_keyring() NULL Dereference Local DoS
  • SA41263: Linux Kernel keyctl_session_to_parent() NULL Pointer Dereference Vulnerability
  • SECTRACK ID: 1024384: Linux Kernel Null Pointer Dereference in keyctl_session_to_parent() May Let Local Users Gain Elevated Privileges
  • SUSE-SA:2010:046: openSUSE 11.2 kernel security update
  • SUSE-SA:2010:047: openSUSE 11.3 kernel security update
  • SUSE-SA:2010:050: Linux Kernel security update
  • SUSE-SA:2011:007: Linux realtime kernel security update

Platforms Affected:

  • Linux Kernel 2.6.0

Reported:

Sep 02, 2010

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The information within this database may change without notice. Use of this information constitutes acceptance for use in an AS IS condition. There are NO warranties, implied or otherwise, with regard to this information or its use. Any use of this information is at the user's risk. In no event shall IBM be held liable for any damages whatsoever arising out of or in connection with the use or spread of this information.

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