CVE-2019-13161

Description

An issue was discovered in Asterisk Open Source through 13.27.0, 14.x and 15.x through 15.7.2, and 16.x through 16.4.0, and Certified Asterisk through 13.21-cert3. A pointer dereference in chan_sip while handling SDP negotiation allows an attacker to crash Asterisk when handling an SDP answer to an outgoing T.38 re-invite. To exploit this vulnerability 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).

Category

5.3
CVSS
Severity: Medium
CVSS 3.1 •
CVSS 2.0 •
EPSS 2.30% Top 20%
Vendor Advisory digium.com Vendor Advisory asterisk.org
Affected: n/a n/a
Published at:
Updated at:

References

Link Tags
http://downloads.digium.com/pub/security/AST-2019-003.html vendor advisory
https://issues.asterisk.org/jira/browse/ASTERISK-28465 vendor advisory issue tracking
https://lists.debian.org/debian-lts-announce/2019/11/msg00038.html third party advisory mailing list
https://lists.debian.org/debian-lts-announce/2022/04/msg00001.html third party advisory mailing list

Frequently Asked Questions

What is the severity of CVE-2019-13161?
CVE-2019-13161 has been scored as a medium severity vulnerability.
How to fix CVE-2019-13161?
To fix CVE-2019-13161, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2019-13161 being actively exploited in the wild?
It is possible that CVE-2019-13161 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~2% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
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