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Vulnerability Note VU#649732

Samba AFS ACL mapping VFS plug-in format string vulnerability

Overview

Samba AFS ACL mapping VFS plug-in contains a format string vulnerability. This vulnerability may allow a remote attacker to execute arbitrary code on a vulnerable system.

I. Description

Samba AFS ACL mapping VFS plug-in fails to properly sanitize user-controlled file names that are used in a format specifier supplied to snprintf(). According to Samba Security Advisory CVE-2007-0454: Format string bug in afsacl.so VFS plug-in:

    This security advisory only impacts Samba servers that share AFS file systems to CIFS clients and which have been explicitly instructed in smb.conf to load the afsacl.so VFS module.

This vulnerability occurred as a result of failing to comply with rule FIO30-C of the CERT C Programming Language Secure Coding Standard.

II. Impact

If an attacker is able to write a file to a share that uses the afsacl.so library, that attacker may be able to execute arbitrary code.

III. Solution

Apply a patch

According to Samba Security Advisory CVE-2007-0454: Format string bug in afsacl.so VFS plug-in:

    A patch against Samba 3.0.23d has been attached to this email. This fix has be incorporated into the Samba 3.0.24 release. Patches are also available from at the Samba Security page (http://www.samba.org/samba/security).

Systems Affected
VendorStatusDate NotifiedDate Updated
SambaVulnerable7-Feb-2007

References

https://www.securecoding.cert.org/confluence/x/WwE
http://samba.org/samba/security/CVE-2007-0454.html
http://us4.samba.org/samba/ftp/patches/security/samba-3.0.23d-CVE-2007-0454.patch
http://news.samba.org/releases/3.0.24/
http://secunia.com/advisories/24021/
http://secunia.com/advisories/24060/
http://secunia.com/advisories/24046/
http://securitytracker.com/alerts/2007/Feb/1017588.html
http://secunia.com/advisories/24145/
http://www.securityfocus.com/bid/22403

Credit

This vulnerability was reported by Gerald Carter.

This document was written by Jeff Gennari based on information from Samba.

Other Information

Date Public:2007-02-05
Date First Published:2007-02-07
Date Last Updated:2007-03-29
CERT Advisory: 
CVE-ID(s):CVE-2007-0454
NVD-ID(s):CVE-2007-0454
US-CERT Technical Alerts: 
Metric:1.82
Document Revision:21

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