ClamAV: Buffer overflow in Freshclam

1. Gentoo Linux Security Advisory

Package	Vulnerable versions	Unaffected versions	Architecture(s)
app-antivirus/clamav	< 0.88.2	>= 0.88.2	All supported architectures

Related bugreports: #131791

Freshclam is vulnerable to a buffer overflow that could lead to execution of arbitrary code.

2. Impact Information

ClamAV is a GPL virus scanner. Freshclam is a utility to download virus signature updates.

Ulf Harnhammar and an anonymous German researcher discovered that Freshclam fails to check the size of the header data returned by a webserver.

By enticing a user to connect to a malicious webserver an attacker could cause the execution of arbitrary code.

3. Resolution Information

There is no known workaround at this time.

All ClamAV users should upgrade to the latest version:

Code Listing 3.1: Resolution

# emerge --sync
# emerge --ask --oneshot --verbose ">=app-antivirus/clamav-0.88.2"

4. References

Updated May 02, 2006

Summary: This is a Gentoo Linux Security Advisory

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