Improper Resource Shutdown or Release in asterisk (Alpine package)

1) Improper Resource Shutdown or Release

EUVDB-ID: #VU50967

Risk: Medium

CVSSv3.1: 5.2 [CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-26906

CWE-ID: CWE-404 - Improper Resource Shutdown or Release

Exploit availability: No

Description

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

An issue was discovered in res_pjsip_session.c in Digium Asterisk through 13.38.1; 14.x, 15.x, and 16.x through 16.16.0; 17.x through 17.9.1; and 18.x through 18.2.0, and Certified Asterisk through 16.8-cert5. An SDP negotiation vulnerability in PJSIP allows a remote server to potentially crash Asterisk by sending specific SIP responses that cause an SDP negotiation failure.

Mitigation

Install update from vendor's website.

Vulnerable software versions

asterisk (Alpine package): 16.14.1-r0

External links

http://git.alpinelinux.org/aports/commit/?id=2a8bd0c3ec7d7286dd026c2535f523ce889ecda4
http://git.alpinelinux.org/aports/commit/?id=8b4dd3e383247c88e9ff182557e096d12a052634
http://git.alpinelinux.org/aports/commit/?id=9d426cf7a7701ee6707224d3e9f6d07553a56de1

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.