Description
Multiple eval injection vulnerabilities in HylaFAX 4.2.3 and earlier allow remote attackers to execute arbitrary commands via (1) the notify script in HylaFAX 4.2.0 to 4.2.3 and (2) crafted CallID parameters to the faxrcvd script in HylaFAX 4.2.2 and 4.2.3.
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 ↗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
- Hylafax 4.1/4.2 (Multiple Scripts) - Remote Command Execution EDB-27032 · remote · Jan 5, 2006 · verified
Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.
Advisories 1
- DSA-933-1 hylafax - arbitrary command execution Debian Security (DSA / DLA) · Mar 9, 2026
References
- 18314 third-party-advisory
- 16151 vdb-entry
- 18366 third-party-advisory
- 18337 third-party-advisory
- http://www.hylafax.org/content/HylaFAX_4.2.4_release
- GLSA-200601-03 vendor-advisory
- 18489 third-party-advisory
- DSA-933 vendor-advisory
- 20060105 HylaFAX Security advisory - fixed in HylaFAX 4.2.4 mailing-list
- http://bugs.hylafax.org/bugzilla/show_bug.cgi?id=719
- ADV-2006-0072 vdb-entry
- MDKSA-2006:015 vendor-advisory