Race condition in fileserver in OpenAFS 1.3.50 through 1.4.5 and 1.5.0 through 1.5.27 allows remote attackers to cause a denial of service (daemon crash) by simultaneously acquiring and giving back file callbacks, which causes the handler for the GiveUpAllCallBacks RPC to perform linked-list operations without the hostglock lock.

The default configuration in OpenAFS 1.4.x before 1.4.4 and 1.5.x before 1.5.17 supports setuid programs within the local cell, which might allow attackers to gain privileges by spoofing a response to an AFS cache manager FetchStatus request, and setting setuid and root ownership for files in the cache.