CVE-2018-17281 — There is a stack consumption vulnerability in the res_http_websocket

There is a stack consumption vulnerability in the res_http_websocket.so module of Asterisk through 13.23.0, 14.7.x through 14.7.7, and 15.x through 15.6.0 and Certified Asterisk through 13.21-cert2. It allows an attacker to crash Asterisk via a specially crafted HTTP request to u

01What is this vulnerability?

There is a stack consumption vulnerability in the res_http_websocket.so module of Asterisk through 13.23.0, 14.7.x through 14.7.7, and 15.x through 15.6.0 and Certified Asterisk through 13.21-cert2. It allows an attacker to crash Asterisk via a specially crafted HTTP request to upgrade the connection to a websocket.

02Affected products

Vendor	Product	Versions
n	a / n/a	n/a

03Active exploitation status

Not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog. EPSS is the best forward-looking signal — see the EPSS row above.

04Recommended remediation

• Patch to a fixed version listed in the vendor advisory (see references below).
• Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
• Hunt historical logs for exploitation indicators — see Detection signatures below.

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Ask SARA in chat to draft a starting detection for this CVE in your stack of choice.

07Related CVEs

No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.

08Timeline

• Published: 2018-09-24T22:00:00.000Z
• Last modified: 2024-08-05T10:47:04.106Z

09References

• www.securitytracker.com — http://www.securitytracker.com/id/1041694
• seclists.org — http://seclists.org/fulldisclosure/2018/Sep/31
• packetstormsecurity.com — http://packetstormsecurity.com/files/149453/Asterisk-Project-Security-Advisory-A…
• www.debian.org — https://www.debian.org/security/2018/dsa-4320
• seclists.org — https://seclists.org/bugtraq/2018/Sep/53
• issues.asterisk.org — https://issues.asterisk.org/jira/browse/ASTERISK-28013
• lists.debian.org — https://lists.debian.org/debian-lts-announce/2018/09/msg00034.html
• security.gentoo.org — https://security.gentoo.org/glsa/201811-11
• www.securityfocus.com — http://www.securityfocus.com/bid/105389
• downloads.asterisk.org — http://downloads.asterisk.org/pub/security/AST-2018-009.html