Vulnerability CVE-2019-18976
Published: 2019-11-22   Modified: 2019-11-24

Description:
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.

Type:

CWE-476

 (NULL Pointer Dereference)

CVSS2 => (AV:N/AC:L/Au:N/C:N/I:N/A:P)

CVSS Base Score
Impact Subscore
Exploitability Subscore
5/10
2.9/10
10/10
Exploit range
Attack complexity
Authentication
Remote
Low
No required
Confidentiality impact
Integrity impact
Availability impact
None
None
Partial
Affected software
Digium -> Asterisk 
Digium -> Certified asterisk 

 References:
http://downloads.asterisk.org/pub/security/AST-2019-008.html
https://packetstormsecurity.com/files/155436/Asterisk-Project-Security-Advisory-AST-2019-008.html
https://seclists.org/fulldisclosure/2019/Nov/20
https://www.asterisk.org/downloads/security-advisories
https://www.cybersecurity-help.cz/vdb/SB2019112218?affChecked=1
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