#VU49163 Out-of-bounds write in Cherokee webserver - CVE-2019-20800

Vulnerability identifier: #VU49163

Vulnerability risk: High

CVSSv4.0: 8.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber]

CVE-ID: CVE-2019-20800

CWE-ID: CWE-787

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Cherokee webserver
Server applications / Web servers

Vendor: Cherokee-project

Description

The vulnerability allows a remote attacker to compromise vulnerable system.

The vulnerability exists due to a boundary error when processing untrusted input within the cherokee_handler_cgi_add_env_pair() function in handler_cgi.c. A remote attacker can send a specially crafted HTTP GET request with multiple headers to the server, trigger out-of-bounds write and execute arbitrary code on the target system.

Mitigation
Cybersecurity Help is currently unaware of any official solution to address this vulnerability.

Vulnerable software versions

Cherokee webserver: 1.0.12 - 1.2.104

---

External links
https://github.com/cherokee/webserver/issues/1224
https://logicaltrust.net/blog/2019/11/cherokee.html
https://security.gentoo.org/glsa/202012-09

---

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.