Auth bypass in Digium Asterisk
CVE-2019-18790
An issue was discovered in channels/chan_sip.c in Sangoma Asterisk 13.x before 13.29.2, 16.x before 16.6.2, and 17.x before 17.0.1, and Certified Asterisk 13.21 before cert5. A SIP request can be sent to Asterisk that can change a SIP peer's IP address. A REGISTER does not need to occur, and calls can be hijacked as a result. The only thing that needs to be known is the peer's name; authentication details such as passwords do not need to be known. This vulnerability is only exploitable when the nat option is set to the default, or auto_force_rport.
Vulnerability class: Broken Access Control
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N.
EPSS exploit prediction
EPSS: 0.042 (90.6th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 91st percentile — 90.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.020 · newest: 0.042 · change: +0.021
Affected products
- Digium Asterisk
- Digium Certified Asterisk — versions 13.21.0
- Debian Linux — versions 8.0, 9.0
Weakness classification (CWE)
References
- www.asterisk.org/downloads/security-advisories (Vendor Advisory)
- downloads.asterisk.org/pub/security/AST-2019-006.html (Patch, Vendor Advisory)
- lists.debian.org/debian-lts-announce/2019/11/msg00038.html (mailing-list, Mailing List, Third Party Advisory)
- lists.debian.org/debian-lts-announce/2022/04/msg00001.html (mailing-list, Mailing List, Third Party Advisory)
Frequently asked questions
- What is CVE-2019-18790?
- CVE-2019-18790 is a medium-severity vulnerability in Digium Asterisk, classified under Missing Authorization. CVSS score: 6.5/10. Published 2019-11-22.
- How severe is CVE-2019-18790?
- Medium severity. CVSS v3 base score is 6.5 out of 10.