openafs: multiple vulnerabilities

By carefully crafting an ACL entry an attacker may overflow fixed length buffers within the OpenAFS fileserver, crashing the fileserver, and potentially permitting the execution of arbitrary code. To perform the exploit, the attacker must already have permissions to create ACLs on the fileserver in question. Once such an ACL is present on a fileserver, client utilities such as 'fs' which manipulate ACLs, may be crashed when they attempt to read or modify the ACL.(CVE-2013-1794)

The ptserver accepts a list of unbounded size from the IdToName RPC. The length of this list is then used to determine the size of a number of other internal data structures. If the length is sufficiently large then we may hit an integer overflow when calculating the size to pass to malloc, and allocate data structures of insufficient length, allowing heap memory to be overwritten. This may allow an unauthenticated attacker to crash an OpenAFS ptserver. (CVE-2013-1795)