Description
Administration interface in Monit 1.4 through 4.2 allows remote attackers to cause a denial of service (segmentation fault) by sending a Basic Authentication request without a password, which causes Monit to decrement a null pointer and perform an out-of-bounds read.
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 | monit | 1:4.2.1-1 | — |
| Debian 13 | monit | 1:4.2.1-1 | — |
| Debian 12 | monit | 1:4.2.1-1 | — |
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
- Monit 4.2 - Remote Buffer Overflow EDB-174 · remote · Apr 12, 2004 · verified
Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.
References
- http://www.tildeslash.com/monit/changes.html
- 10051 vdb-entry
- http://www.tildeslash.com/monit/secadv_20040305.txt
- 20040405 Advisory: Multiple Vulnerabilities in Monit mailing-list
- 11304 third-party-advisory
- monit-basic-auth-dos(15734) vdb-entry