#VU69829 Integer underflow in Asterisk Open Source and Certified Asterisk - CVE-2022-37325

Vulnerability identifier: #VU69829

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-2022-37325

CWE-ID: CWE-191

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Asterisk Open Source
Server applications / Conferencing, Collaboration and VoIP solutions
Certified Asterisk
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 an integer underflow within the ooh323 module. A remote non-authenticated attacker can initiate a call with a zero length called or calling party number, trigger an integer underflow and crash Asterisk.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Asterisk Open Source: 16.0.0 rc1 - 16.29.0, 17.0.0 rc1 - 17.9.4, 18.0.0 rc1 - 18.15.0, 19.0.0 rc1 - 19.7.0, 20.0.0 rc1 - 20.0.0

Certified Asterisk: 16.3-cert1 - 18.9-cert2

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External links
https://downloads.asterisk.org/pub/security/AST-2022-007.html

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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.