Bug 1801690 (CVE-2019-18976) - CVE-2019-18976 asterisk: null pointer dereference in res_pjsip_t38.c
Summary: CVE-2019-18976 asterisk: null pointer dereference in res_pjsip_t38.c
Keywords:
Status: CLOSED NOTABUG
Alias: CVE-2019-18976
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 1801691
Blocks:
TreeView+ depends on / blocked
 
Reported: 2020-02-11 13:42 UTC by Dhananjay Arunesh
Modified: 2021-10-28 05:24 UTC (History)
4 users (show)

Fixed In Version:
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Last Closed: 2021-10-28 05:24:21 UTC
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Description Dhananjay Arunesh 2020-02-11 13:42:58 UTC 
An issue was discovered in res_pjsip_t38.c in Sangoma Asterisk through 13.x and Certified Asterisk through 13.21-x. If it receives a re-invite initiating T.38 faxing and has a port of 0 and no c line in the SDP, a NULL pointer dereference and crash will occur. This is different from CVE-2019-18940.

Reference:
http://downloads.asterisk.org/pub/security/AST-2019-008.html
https://seclists.org/fulldisclosure/2019/Nov/20
Comment 1 Dhananjay Arunesh 2020-02-11 13:44:23 UTC 
Created asterisk tracking bugs for this issue:

Affects: epel-6 [bug 1801691]
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