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CVE-2013-4851

Status Candidate

Overview

The vfs_hang_addrlist function in sys/kern/vfs_export.c in the NFS server implementation in the kernel in FreeBSD 8.3 and 9.x through 9.1-RELEASE-p5 controls authorization for host/subnet export entries on the basis of group information sent by the client, which allows remote attackers to bypass file permissions on NFS filesystems via crafted requests.

Related Files

Debian Security Advisory 2743-1
Posted Aug 27, 2013
Authored by Debian | Site debian.org

Debian Linux Security Advisory 2743-1 - Several vulnerabilities have been discovered in the FreeBSD kernel that may lead to a privilege escalation or information leak.

tags | advisory, kernel, vulnerability
systems | linux, freebsd, debian
advisories | CVE-2013-3077, CVE-2013-4851, CVE-2013-5209
SHA-256 | 569d8b0cda13d3a73e841bf15e6cefd040a645974771d3bc8fc7fc5adeea0929
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
SHA-256 | d672bbe3c1c06396c194b1f5062f4d67d79b24f02a60b7a89344ec0f57fe8219
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