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Files from Rick Macklem

First Active2013-07-29
Last Active2014-04-09
FreeBSD Security Advisory - NFS Server Deadlock
Posted Apr 9, 2014
Authored by Rick Macklem | Site security.freebsd.org

FreeBSD Security Advisory - The Network File System (NFS) allows a host to export some or all of its file systems so that other hosts can access them over the network and mount them as if they were on local disks. FreeBSD includes both server and client implementations of NFS. The kernel holds a lock over the source directory vnode while trying to convert the target directory file handle to a vnode, which needs to be returned with the lock held, too. This order may be in violation of normal lock order, which in conjunction with other threads that grab locks in the right order, constitutes a deadlock condition because no thread can proceed. An attacker on a trusted client could cause the NFS server become deadlocked, resulting in a denial of service.

tags | advisory, denial of service, kernel, local
systems | freebsd
advisories | CVE-2014-1453
MD5 | c5cc5bd2d9b6638b99872d4bcc30b466
FreeBSD Security Advisory - NFS Incorrect Privilege Validation
Posted Jul 29, 2013
Authored by Tim Zingelman, Christopher Key, Rick Macklem | Site security.freebsd.org

FreeBSD Security Advisory - The kernel incorrectly uses client supplied credentials instead of the one configured in exports(5) when filling out the anonymous credential for a NFS export, when -network or -host restrictions are used at the same time. The remote client may supply privileged credentials (e.g. the root user) when accessing a file under the NFS share, which will bypass the normal access checks.

tags | advisory, remote, kernel, root
systems | freebsd
advisories | CVE-2013-4851
MD5 | cbce467b7418702904d48e4d09f0a883
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