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ClamAV: Multiple Denials of Service


1.  Gentoo Linux Security Advisory

Version Information

Advisory Reference GLSA 200706-05 / clamav
Release Date June 15, 2007
Latest Revision June 15, 2007: 01
Impact normal
Exploitable remote, local
Package Vulnerable versions Unaffected versions Architecture(s)
app-antivirus/clamav < 0.90.3 >= 0.90.3 All supported architectures

Related bugreports: #178082


ClamAV contains several vulnerabilities leading to a Denial of Service.

2.  Impact Information


ClamAV is a GPL virus scanner.


Several vulnerabilities were discovered in ClamAV by various researchers:

  • Victor Stinner (INL) discovered that the OLE2 parser may enter in an infinite loop (CVE-2007-2650).
  • A boundary error was also reported by an anonymous researcher in the file unsp.c, which might lead to a buffer overflow (CVE-2007-3023).
  • The file unrar.c contains a heap-based buffer overflow via a modified vm_codesize value from a RAR file (CVE-2007-3123).
  • The RAR parsing engine can be bypassed via a RAR file with a header flag value of 10 (CVE-2007-3122).
  • The cli_gentempstream() function from clamdscan creates temporary files with insecure permissions (CVE-2007-3024).


A remote attacker could send a specially crafted file to the scanner, possibly triggering one of the vulnerabilities. The two buffer overflows are reported to only cause Denial of Service. This would lead to a Denial of Service by CPU consumption or a crash of the scanner. The insecure temporary file creation vulnerability could be used by a local user to access sensitive data.

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-0.90.3"

4.  References


Page updated June 15, 2007

Summary: This is a Gentoo Linux Security Advisory

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