SB2021022612 - Improper Resource Shutdown or Release in asterisk (Alpine package)

Description

This security bulletin contains information about 1 vulnerability.

1) Improper Resource Shutdown or Release (CVE-ID: CVE-2021-26906)

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

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green

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.

Remediation

Install update from vendor's website.

References

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