#VU62355 Resource exhaustion in Asterisk Open Source - CVE-2022-26498

Vulnerability identifier: #VU62355

Vulnerability risk: Medium

CVSSv4.0: 6.6 [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/E:U/U:Green]

CVE-ID: CVE-2022-26498

CWE-ID: CWE-400

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Asterisk Open Source
Server applications / Conferencing, Collaboration and VoIP solutions

Vendor: Digium (Linux Support Services)

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to application does not properly control consumption of internal resources ub res_stir_shaken module. A remote attacker can force the application to download large files that are not certificates, which can result in a denial of service condition.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Asterisk Open Source: 16.0.0 rc1 - 16.25.1, 17.0.0 rc1 - 17.9.4, 18.0.0 rc1 - 18.11.1, 19.0.0 rc1 - 19.3.1

---

External links
https://downloads.asterisk.org/pub/security/AST-2022-001.html

---

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.