Allocation of Resources Without Limits or Throttling in OpenBSD - CVE-2017-5850
Published: March 27, 2017 / Updated: August 9, 2020
Vulnerability identifier: #VU39366
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2017-5850
CWE-ID: CWE-770
Exploitation vector: Remote access
Exploit availability:
Public exploit is available
Vulnerability details
The vulnerability allows a remote non-authenticated attacker to perform a denial of service (DoS) attack.
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.
Affected software
OpenBSD
How to mitigate CVE-2017-5850
Install update from vendor's website.
Links to Public Exploits and PoC-codes
External 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/