CVE-2017-5850
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.
Predictions
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
No mitigations published for this CVE yet.
The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.
✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here withsource_tier=community-verified.
Exploits
Public proof-of-concept code below. AS-IS, for defenders and authorised testing only.
Exploit-DB
OpenBSD HTTPd < 6.0 - Memory Exhaustion Denial of Service
OS impact
| OS | Version | Status | Fixed in |
|---|---|---|---|
| freebsd | 6.0 | affected | |
References
- http://marc.info/?l=openbsd-cvs&m=148587359420912&w=2
- http://packetstormsecurity.com/files/140944/OpenBSD-HTTP-Server-6.0-Denial-Of-Service.html
- http://seclists.org/fulldisclosure/2017/Feb/15
- http://www.openwall.com/lists/oss-security/2017/02/02/6
- http://www.securityfocus.com/bid/95997
- http://www.securitytracker.com/id/1037758
- 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
- https://github.com/openbsd/src/commit/142cfc82b932bc211218fbd7bdda8c7ce83f19df
- https://pierrekim.github.io/blog/2017-02-07-openbsd-httpd-CVE-2017-5850.html
- https://www.exploit-db.com/exploits/41278/
- http://marc.info/?l=openbsd-cvs&m=148587359420912&w=2
- http://packetstormsecurity.com/files/140944/OpenBSD-HTTP-Server-6.0-Denial-Of-Service.html
- http://seclists.org/fulldisclosure/2017/Feb/15
- http://www.openwall.com/lists/oss-security/2017/02/02/6
- http://www.securityfocus.com/bid/95997
- http://www.securitytracker.com/id/1037758
- 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
- https://github.com/openbsd/src/commit/142cfc82b932bc211218fbd7bdda8c7ce83f19df
- https://pierrekim.github.io/blog/2017-02-07-openbsd-httpd-CVE-2017-5850.html
- https://www.exploit-db.com/exploits/41278/
CWEs
CWE-770
Community-verified mitigations for this CVE will appear above when contributors publish them.
Verify integrity in audit chain (admin only). AS-IS.