Thomas Biege wrote:
The iSEC people have read the nfsd code from 2.4 and it seems to be vulnerable too, however only authenticated clients could reach the problematic places at all. Having a writeable NFS share is probably a bad idea anyway...Various signedness issues and integer overflows have been fixed within kNFSd and the XDR decode functions of kernel 2.6. These bugs can be triggered remotely by sending a package with a trusted source IP address and a write request with a size greater then 2^31. The result will be a kernel Oops, it is unknown if this bug is otherwise exploitable yet. Kernel 2.4 nfsd code is different but may suffer from the same vulnerability.