Description
httpd in OpenBSD allows remote attackers to cause a denial of service (memory consumption) via a series of requests for a large file using an HTTP Range header.
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
- OpenBSD HTTPd < 6.0 - Memory Exhaustion Denial of Service EDB-41278 · dos · Feb 7, 2017
Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.
References
- [oss-security] 20170202 Re: CVE requests: OpenBSD httpd - 2 DoS mailing-list
- https://pierrekim.github.io/blog/2017-02-07-openbsd-httpd-CVE-2017-5850.html
- 95997 vdb-entry
- https://github.com/openbsd/src/commit/142cfc82b932bc211218fbd7bdda8c7ce83f19df
- 41278 exploit
- 1037758 vdb-entry
- [openbsd-cvs] 20170131 cvs.openbsd.org: src mailing-list
- https://ftp.openbsd.org/pub/OpenBSD/patches/5.9/common/034_httpd.patch.sig
- https://ftp.openbsd.org/pub/OpenBSD/patches/6.0/common/017_httpd.patch.sig
- 20170206 Remote DoS against OpenBSD http server (up to 6.0) mailing-list
- http://packetstormsecurity.com/files/140944/OpenBSD-HTTP-Server-6.0-Denial-Of-Service.html