CVE-2019-15297 — res_pjsip_t38 in Sangoma Asterisk 15

res_pjsip_t38 in Sangoma Asterisk 15.x before 15.7.4 and 16.x before 16.5.1 allows an attacker to trigger a crash by sending a declined stream in a response to a T.38 re-invite initiated by Asterisk. The crash occurs because of a NULL session media object dereference.

01What is this vulnerability?

res_pjsip_t38 in Sangoma Asterisk 15.x before 15.7.4 and 16.x before 16.5.1 allows an attacker to trigger a crash by sending a declined stream in a response to a T.38 re-invite initiated by Asterisk. The crash occurs because of a NULL session media object dereference.

02Affected products

Vendor	Product	Versions
n	a / n/a	n/a

03Active exploitation status

Not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog. EPSS is the best forward-looking signal — see the EPSS row above.

04Recommended remediation

• Patch to a fixed version listed in the vendor advisory (see references below).
• Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
• Hunt historical logs for exploitation indicators — see Detection signatures below.

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Ask SARA in chat to draft a starting detection for this CVE in your stack of choice.

07Related CVEs

No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.

08Timeline

• Published: 2019-09-09T20:48:12.000Z
• Last modified: 2024-08-05T00:42:03.821Z

09References

• packetstormsecurity.com — http://packetstormsecurity.com/files/154371/Asterisk-Project-Security-Advisory-A…
• downloads.asterisk.org — http://downloads.asterisk.org/pub/security/AST-2019-004.html
• seclists.org — http://seclists.org/fulldisclosure/2021/Mar/5
• packetstormsecurity.com — http://packetstormsecurity.com/files/161671/Asterisk-Project-Security-Advisory-A…