CVE-2021-26717 Information

Description

An issue was discovered in Sangoma Asterisk 16.x before 16.16.1 17.x before 17.9.2 and 18.x before 18.2.1 and Certified Asterisk before 16.8-cert6. When re-negotiating for T.38 if the initial remote response was delayed just enough Asterisk would send both audio and T.38 in the SDP. If this happened and the remote responded with a declined T.38 stream then Asterisk would crash.

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Reference

https://downloads.asterisk.org/pub/security/ http://seclists.org/fulldisclosure/2021/Feb/58 https://issues.asterisk.org/jira/browse/ASTERISK-29203 https://downloads.asterisk.org/pub/security/AST-2021-002.html http://packetstormsecurity.com/files/161471/Asterisk-Project-Security-Advisory-AST-2021-002.html

Attack Complexity

LOW

Privileges Required

NONE

User Interaction Required

NONE

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

NONE

Availability Impact

NONE

Base Score

HIGH

Base Severity

7.5