Public Vulnerability Reports

Kaspersky Anti-Virus Local Denial of Service Vulnerability

07.29.03

BACKGROUND

Kaspersky Anti-Virus software is a multi-platform anti-virus software package that is developed by Kaspersky Labs.

DESCRIPTION

A locally exploitable exceptional condition error exists in the KAVdaemon module of Kaspersky Labs' Anti-Virus software. The flaw can lead to a denial-of-service condition.

KAVdaemon uses a Unix domain socket to listen for requests. Every time a request comes, a new process is spawned without a limit. Thus, by sending a large number of requests, an attacker can cause a DoS because the processes are running as root. The processes, therefore, are not counted against the attacker's limits.

Any user can send requests, as the var/run/AvpCtl file is world-writable. This bug does not require an exploit. An attacker may simply run AvpDaemonClient (DaemonClients/Sample/) several times.

ANALYSIS

Vulnerabilities in anti-virus software can be very troublesome, as these products are supposed to increase security.

iDEFENSE has proof of concept exploit code demonstrating the impact of this vulnerability.

DETECTION

The latest version of Kaspersky Anti-Virus for Linux, 4.0, is vulnerable. It is suspected that previous versions are vulnerable as well.

VENDOR RESPONSE

No vendor fix is currently available.

CVE INFORMATION

A Mitre Corp. Common Vulnerabilities and Exposures (CVE) number has not been assigned to this issue.

DISCLOSURE TIMELINE

04/20/2003   Exploit acquired by iDEFENSE
07/01/2003   Initial vendor notification
07/15/2003   iDEFENSE Clients notified
07/29/2003   Public Disclosure

CREDIT

This vulnerability is credited to Peter Kosinar.

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LEGAL NOTICES

Copyright © 2004 Verisign, Inc.

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