Description
The RAR VM (unrarvm.c) in Clam Antivirus (ClamAV) before 0.91 allows user-assisted remote attackers to cause a denial of service (crash) via a crafted RAR archive, resulting in a NULL pointer dereference.
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | clamav | 0.91-1 | — |
| Debian 13 | clamav | 0.91-1 | — |
| Debian 12 | clamav | 0.91-1 | — |
| Debian 5.0 | clamav | 0.90.1-3.1lenny3 | DTSA-43-1 |
| Debian 4.0 | clamav | 0.90.1-3etch4 | DSA-1340-1 |
Public exploits
Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.
Third-party code, not reviewed by us. Public PoCs are sometimes fake or contain malware. Read the code first and run it only in an isolated lab, against systems you are authorised to test.
Exploit-DB 1
- ClamAV / UnRAR - .RAR Handling Remote Null Pointer Dereference EDB-30291 · remote · Jul 11, 2007 · verified
Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.
Advisories 2
- DTSA-43-1 clamav - several vulnerabilities Debian Security (DSA / DLA) · Mar 9, 2026
- DSA-1340-1 clamav - null pointer dereference Debian Security (DSA / DLA) · Mar 9, 2026
References
- 26231 third-party-advisory
- clamav-rarvm-dos(35367) vdb-entry
- http://kolab.org/security/kolab-vendor-notice-16.txt
- ADV-2007-2509 vdb-entry
- 26164 third-party-advisory
- DSA-1340 vendor-advisory
- 26226 third-party-advisory
- 26038 third-party-advisory
- 20070711 Advisory - Clam AntiVirus RAR File Handling Denial Of Service Vulnerability. mailing-list
- ADV-2008-0924 vdb-entry
- GLSA-200708-04 vendor-advisory
- 36907 vdb-entry
- https://wwws.clamav.net/bugzilla/show_bug.cgi?id=555
- MDKSA-2007:150 vendor-advisory
- 29420 third-party-advisory
- APPLE-SA-2008-03-18 vendor-advisory
- 2007-0023 vendor-advisory
- http://www.metaeye.org/advisories/54
- 26209 third-party-advisory
- 20070711 Advisory - Clam AntiVirus RAR File Handling Denial Of Service Vulnerability. mailing-list
- http://docs.info.apple.com/article.html?artnum=307562
- 26377 third-party-advisory
- ADV-2007-2643 vdb-entry
- SUSE-SR:2007:015 vendor-advisory