CVE-2019-18976 : An issue was discovered in res_pjsip_t38.c in Sangoma Asterisk through 13.x and

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.

Published 2019-11-22 17:15:12

Updated 2022-06-03 14:41:01

Source MITRE

View at NVD, CVE.org

Vulnerability category: Memory Corruption

Products affected by CVE-2019-18976

Debian » Debian Linux » Version: 9.0
cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*
Matching versions
Digium » Asterisk
Versions from including (>=) 13.0.0 and up to, including, (<=) 13.29.1
cpe:2.3:a:digium:asterisk:*:*:*:*:*:*:*:*
Matching versions
Digium » Certified Asterisk » Version: 13.21 Update Cert1
cpe:2.3:a:digium:certified_asterisk:13.21:cert1:*:*:*:*:*:*
Matching versions
Digium » Certified Asterisk » Version: 13.21 Update Cert2
cpe:2.3:a:digium:certified_asterisk:13.21:cert2:*:*:*:*:*:*
Matching versions
Digium » Certified Asterisk » Version: 13.21 Update Cert3
cpe:2.3:a:digium:certified_asterisk:13.21:cert3:*:*:*:*:*:*
Matching versions
Digium » Certified Asterisk » Version: 13.21
cpe:2.3:a:digium:certified_asterisk:13.21:*:*:*:*:*:*:*
Matching versions
Digium » Certified Asterisk » Version: 13.21 Update Cert4
cpe:2.3:a:digium:certified_asterisk:13.21:cert4:*:*:*:*:*:*
Matching versions

Threat overview for CVE-2019-18976

Top countries where our scanners detected CVE-2019-18976

Top open port discovered on systems with this issue 8088

IPs affected by CVE-2019-18976 12,655

Threat actors abusing to this issue? Yes

Find out if you^* are affected by CVE-2019-18976!

^*Directly or indirectly through your vendors, service providers and 3rd parties. Powered by attack surface intelligence from SecurityScorecard.

Exploit prediction scoring system (EPSS) score for CVE-2019-18976

EPSS FAQ

15.44%

Probability of exploitation activity in the next 30 days EPSS Score History

~ 96 %

Percentile, the proportion of vulnerabilities that are scored at or less

CVSS scores for CVE-2019-18976

Base Score	Base Severity	CVSS Vector	Exploitability Score	Impact Score	Score Source
5.0	MEDIUM	AV:N/AC:L/Au:N/C:N/I:N/A:P	10.0	2.9	NIST
Access Vector: Network Access Complexity: Low Authentication: None Confidentiality Impact: None Integrity Impact: None Availability Impact: Partial
7.5	HIGH	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H	3.9	3.6	NIST
Attack Vector: Network Attack Complexity: Low Privileges Required: None User Interaction: None Scope: Unchanged Confidentiality: None Integrity: None Availability: High

CWE ids for CVE-2019-18976

CWE-476 NULL Pointer Dereference

The product dereferences a pointer that it expects to be valid but is NULL.

Assigned by: nvd@nist.gov (Primary)

References for CVE-2019-18976

https://lists.debian.org/debian-lts-announce/2022/04/msg00001.html

[SECURITY] [DLA 2969-1] asterisk security update
Mailing List;Third Party Advisory

CVEs referencing this url
https://packetstormsecurity.com/files/155436/Asterisk-Project-Security-Advisory-AST-2019-008.html

Asterisk Project Security Advisory - AST-2019-008 ≈ Packet Storm
Third Party Advisory;VDB Entry
https://www.asterisk.org/downloads/security-advisories

VoIP Security | Asterisk Security Advisories
Vendor Advisory

CVEs referencing this url
https://seclists.org/fulldisclosure/2019/Nov/20

Full Disclosure: AST-2019-008: Re-invite with T.38 and malformed SDP causes crash.
Mailing List;Third Party Advisory
https://www.cybersecurity-help.cz/vdb/SB2019112218?affChecked=1

Multiple vulnerabilities in Digium Asterisk and Certified Asterisk
Third Party Advisory
http://downloads.asterisk.org/pub/security/AST-2019-008.html

Vendor Advisory