Input validation error in FreeBSD

1) Input validation error

EUVDB-ID: #VU42858

Risk: Medium

CVSSv3.1: 6.4 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:U/RL:O/RC:C]

CVE-ID: CVE-2013-3266

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

The vulnerability allows a remote non-authenticated attacker to read and manipulate data.

The nfsrvd_readdir function in sys/fs/nfsserver/nfs_nfsdport.c in the new NFS server in FreeBSD 8.0 through 9.1-RELEASE-p3 does not verify that a READDIR request is for a directory node, which allows remote attackers to cause a denial of service (memory corruption) or possibly execute arbitrary code by specifying a plain file instead of a directory.

Mitigation

Install update from vendor's website.

Vulnerable software versions

FreeBSD: 8.0 - 9.1

External links

http://secunia.com/advisories/53241
http://www.debian.org/security/2013/dsa-2672
http://www.freebsd.org/security/advisories/FreeBSD-SA-13:05.nfsserver.asc
http://www.securitytracker.com/id/1028491

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.