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.
References
- http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=886e3b7fe6054230c89ae078a09565ed183ecc73
- USN-864-1 vendor-advisory
- [oss-security] 20091022 CVE request: kernel: nfsd4: fix null dereference creating nfsv4 callback client mailing-list
- [oss-security] 20091022 Re: CVE request: kernel: nfsd4: fix null dereference creating nfsv4 callback client mailing-list
- http://www.kernel.org/pub/linux/kernel/v2.6/testing/ChangeLog-2.6.32-rc1
- https://bugzilla.redhat.com/show_bug.cgi?id=530269
- http://www.kernel.org/pub/linux/kernel/v2.6/ChangeLog-2.6.31.2
- http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=80fc015bdfe1f5b870c1e1ee02d78e709523fee7