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.
Weakness
The product dereferences a pointer that it expects to be valid but is NULL.
Affected Software
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Linux_kernel | Linux | * | 2.6.35.4 (excluding) |
| Linux | Ubuntu | lucid | * |
| Linux-ec2 | Ubuntu | karmic | * |
| Linux-ec2 | Ubuntu | lucid | * |
| Linux-ec2 | Ubuntu | maverick | * |
| Linux-lts-backport-maverick | Ubuntu | lucid | * |
| Linux-mvl-dove | Ubuntu | karmic | * |
| Linux-mvl-dove | Ubuntu | lucid | * |
| Linux-mvl-dove | Ubuntu | maverick | * |
| Linux-ti-omap4 | Ubuntu | maverick | * |
Potential Mitigations
References
- http://lists.opensuse.org/opensuse-security-announce/2010-10/msg00003.html
- http://lists.opensuse.org/opensuse-security-announce/2011-02/msg00000.html
- http://secunia.com/advisories/41263
- http://securitytracker.com/id?1024384
- http://twitter.com/taviso/statuses/22777866582
- http://www.openwall.com/lists/oss-security/2010/09/02/1
- http://www.securityfocus.com/bid/42932
- http://www.ubuntu.com/usn/USN-1000-1
- http://www.vupen.com/english/advisories/2011/0298
- https://bugzilla.redhat.com/show_bug.cgi?id=627440
- https://exchange.xforce.ibmcloud.com/vulnerabilities/61557
- http://lists.opensuse.org/opensuse-security-announce/2010-10/msg00003.html
- http://lists.opensuse.org/opensuse-security-announce/2011-02/msg00000.html
- http://secunia.com/advisories/41263
- http://securitytracker.com/id?1024384
- http://twitter.com/taviso/statuses/22777866582
- http://www.openwall.com/lists/oss-security/2010/09/02/1
- http://www.securityfocus.com/bid/42932
- http://www.ubuntu.com/usn/USN-1000-1
- http://www.vupen.com/english/advisories/2011/0298
- https://bugzilla.redhat.com/show_bug.cgi?id=627440
- https://exchange.xforce.ibmcloud.com/vulnerabilities/61557