Re: SUSE Security Announcement: kernel (SUSE-SA:2004:028)

[Paul Starzetz <paul@xxxxxxxxxxx>]

Thomas Biege wrote:

>    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.
>  
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...