CVE-2009-3623: Null Pointer Dereference

First published: Thu Oct 22 2009(Updated: )

Quoting from upstream patch: On setting up the callback to the client, we attempt to use the same authentication flavor the client did. We find an rpc cred to use by calling rpcauth_lookup_credcache(), which assumes that the given authentication flavor has a credentials cache. However, this is not required to be true--in particular, auth_null does not use one. Instead, we should call the auth's lookup_cred() method. Without this, a client attempting to mount using nfsv4 and auth_null triggers a null dereference. The code was introduced in upstream commit 3cef9ab2 (v2.6.31-rc1), fixed in 886e3b7f (v2.6.32-rc1), and was later replaced by 80fc015b.

Credit: secalert@redhat.com

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