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CVE-2011-1739

Status Candidate

Overview

The makemask function in mountd.c in mountd in FreeBSD 7.4 through 8.2 does not properly handle a -network field specifying a CIDR block with a prefix length that is not an integer multiple of 8, which allows remote attackers to bypass intended access restrictions in opportunistic circumstances via an NFS mount request.

Related Files

FreeBSD Security Advisory - mountd ACL Mishandling
Posted Apr 21, 2011
Site security.freebsd.org

FreeBSD Security Advisory - The mountd(8) daemon services NFS mount requests from other client machines. When mountd is started, it loads the export host addresses and options into the kernel using the mount(2) system call. While parsing the exports(5) table, a network mask in the form of "-network=netname/prefixlength" results in an incorrect network mask being computed if the prefix length is not a multiple of 8. For example, specifying the ACL for an export as "-network 192.0.2.0/23" would result in a netmask of 255.255.127.0 being used instead of the correct netmask of 255.255.254.0.

tags | advisory, kernel
systems | freebsd
advisories | CVE-2011-1739
SHA-256 | daab8415751957e3ad1463b8ec1447aa42b593613cb89eb97366e0b6b20911e2
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