Vulnerability CVE-2009-3623
Published: 2009-10-30   Modified: 2012-02-13

Description:
The lookup_cb_cred function in fs/nfsd/nfs4callback.c in the nfsd4 subsystem in the Linux kernel before 2.6.31.2 attempts to access a credentials cache even when a client specifies the AUTH_NULL authentication flavor, which allows remote attackers to cause a denial of service (NULL pointer dereference and system crash) via an NFSv4 mount request.

See advisories in our WLB2 database:
Topic
Author
Date
High
linux kernel 2.6.25.15 nfsd4: fix null dereference creating nfsv4 callback
Eugene Teoeugene...
05.11.2009

Type:

CWE-287

 (Improper Authentication)

CVSS2 => (AV:N/AC:L/Au:N/C:N/I:N/A:C)

CVSS Base Score
Impact Subscore
Exploitability Subscore
7.8/10
6.9/10
10/10
Exploit range
Attack complexity
Authentication
Remote
Low
No required
Confidentiality impact
Integrity impact
Availability impact
None
None
Complete
Affected software
Linux -> Kernel 

 References:
https://bugzilla.redhat.com/show_bug.cgi?id=530269
http://www.ubuntu.com/usn/usn-864-1
http://www.kernel.org/pub/linux/kernel/v2.6/testing/ChangeLog-2.6.32-rc1
http://www.kernel.org/pub/linux/kernel/v2.6/ChangeLog-2.6.31.2
http://marc.info/?l=oss-security&m=125624036516377&w=2
http://marc.info/?l=oss-security&m=125618753029631&w=2
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=886e3b7fe6054230c89ae078a09565ed183ecc73
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=80fc015bdfe1f5b870c1e1ee02d78e709523fee7
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