PT-2019-13165 · Sangoma+1 · Asterisk+1

Fcastellano + 1 · Published 2019-07-12 · Updated 2022-06-01 · CVE-2019-13161

Positive Technologies (AI Summary)

CVSS v3.1

5.3

Medium

Base vector

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

Name of the Vulnerable Software and Affected Versions Asterisk Open Source versions 13.27.0 and earlier, 14.x, 15.x through 15.7.2, and 16.x through 16.4.0 Certified Asterisk version 13.21-cert3

Description An issue allows an attacker to crash Asterisk when handling an SDP answer to an outgoing T.38 re-invite. To exploit this, an attacker must cause the chan sip module to send a T.38 re-invite request to them. Upon receipt, the attacker must send an SDP answer containing both a T.38 UDPTL stream and another media stream containing only a codec, which is not permitted according to the chan sip configuration.

Recommendations For Asterisk Open Source versions 13.27.0 and earlier, 14.x, 15.x through 15.7.2, and 16.x through 16.4.0, update to a version that contains a fix for this issue. For Certified Asterisk version 13.21-cert3, update to a version that contains a fix for this issue. As a temporary workaround, consider disabling the chan sip module until a patch is available. Restrict access to the T.38 re-invite request to minimize the risk of exploitation. Avoid using the SDP answer containing both a T.38 UDPTL stream and another media stream containing only a codec in the affected chan sip configuration until the issue is resolved.

Fix

NULL Pointer Dereference

Weakness Enumeration

CWE-476

Related Identifiers

ALT-PU-2019-2555

CVE-2019-13161

DLA-2017-1

DLA-2017-2

DLA-2969-1

Affected Products

Alt Linux

Asterisk

References · 31

• https://osv.dev/vulnerability/DLA-2017-1 · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2019-13161 · Vendor Advisory
• https://errata.altlinux.org/ALT-PU-2019-2555 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2019-13161 · Security Note
• https://issues.asterisk.org/jira/browse/ASTERISK-28465 · Vendor Advisory
• https://osv.dev/vulnerability/ALPINE-CVE-2019-13161 · Vendor Advisory
• https://osv.dev/vulnerability/DLA-2017-2 · Vendor Advisory
• http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-28242 · Security Note
• https://security-tracker.debian.org/tracker/DLA-2017-2 · Vendor Advisory
• http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-13161 · Security Note
• http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-18790 · Security Note
• https://security-tracker.debian.org/tracker/DLA-2969-1 · Vendor Advisory
• http://downloads.digium.com/pub/security/AST-2019-003.html · Vendor Advisory
• http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-18610 · Security Note
• https://bdu.fstec.ru/vul/2021-03298 · Security Note