CVE-2019-18976: Null Pointer Dereference
First published: Fri Nov 22 2019(Updated: )
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.
Credit: cve@mitre.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Digium Asterisk | >=13.0.0<=13.29.1 | |
| Digium Certified Asterisk | =13.21 | |
| Digium Certified Asterisk | =13.21-cert1 | |
| Digium Certified Asterisk | =13.21-cert2 | |
| Digium Certified Asterisk | =13.21-cert3 | |
| Digium Certified Asterisk | =13.21-cert4 | |
| Debian Debian Linux | =9.0 |
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Reference Links
- http://downloads.asterisk.org/pub/security/AST-2019-008.html
- https://lists.debian.org/debian-lts-announce/2022/04/msg00001.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
Frequently Asked Questions
What is CVE-2019-18976?
CVE-2019-18976 is a vulnerability in Sangoma Asterisk and Certified Asterisk that allows for a NULL pointer dereference and crash.
How does CVE-2019-18976 affect Digium Asterisk?
Digium Asterisk versions between 13.0.0 and 13.29.1 are affected by CVE-2019-18976.
How does CVE-2019-18976 affect Digium Certified Asterisk?
Digium Certified Asterisk version 13.21, as well as its certified subversions (cert1, cert2, cert3, and cert4), are affected by CVE-2019-18976.
What is the severity of CVE-2019-18976?
CVE-2019-18976 has a severity score of 7.5 (High).
How can I fix CVE-2019-18976?
To fix CVE-2019-18976, it is recommended to update Sangoma Asterisk to versions beyond 13.x and Certified Asterisk to versions beyond 13.21-x.
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- agent/author
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- agent/references
- agent/description
- agent/type
- agent/event
- agent/softwarecombine
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- agent/tags
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- collector/mitre-cve
- source/MITRE
- vendor/digium
- canonical/digium asterisk
- version/digium asterisk/13.0.0
- version/digium asterisk/13.29.1
- canonical/digium certified asterisk
- version/digium certified asterisk/13.21
- version/digium certified asterisk/13.21-cert1
- version/digium certified asterisk/13.21-cert2
- version/digium certified asterisk/13.21-cert3
- version/digium certified asterisk/13.21-cert4
- vendor/debian
- canonical/debian debian linux
- version/debian debian linux/9.0