Vulnerability · Published Dec 14, 2023 · Assigned by GitHub_M
CVE-2023-37457Asterisk's PJSIP_HEADER dialplan function can overwrite memory/cause crash when using 'update'
High 7.5
In plain English
A high-severity buffer overflow in asterisk from asterisk. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 1.1% (higher than 66% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
Asterisk is an open source private branch exchange and telephony toolkit. In Asterisk versions 18.20.0 and prior, 20.5.0 and prior, and 21.0.0; as well as ceritifed-asterisk 18.9-cert5 and prior, the 'update' functionality of the PJSIP_HEADER dialplan function can exceed the available buffer space for storing the new value of a header. By doing so this can overwrite memory or cause a crash. This is not externally exploitable, unless dialplan is explicitly written to update a header based on data from an outside source. If the 'update' functionality is not used the vulnerability does not occur. A patch is available at commit a1ca0268254374b515fa5992f01340f7717113fa.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine:v3.20 | asterisk | 20.5.1-r0 | ALPINE-CVE-2023-37457 |
| Alpine:v3.21 | asterisk | 20.5.1-r0 | ALPINE-CVE-2023-37457 |
| Alpine:v3.22 | asterisk | 20.5.1-r0 | ALPINE-CVE-2023-37457 |
| Alpine:v3.23 | asterisk | 20.5.1-r0 | ALPINE-CVE-2023-37457 |
| Alpine:v3.24 | asterisk | 20.5.1-r0 | ALPINE-CVE-2023-37457 |
| Debian:14 | asterisk | 1:20.8.1~dfsg+~cs6.14.40431414-1 | DEBIAN-CVE-2023-37457 |
| Ubuntu:22.04:LTS | asterisk | no fix listed | UBUNTU-CVE-2023-37457 |
| Ubuntu:24.04:LTS | asterisk | no fix listed | UBUNTU-CVE-2023-37457 |
| Ubuntu:25.10 | asterisk | no fix listed | UBUNTU-CVE-2023-37457 |
| Ubuntu:26.04:LTS | asterisk | no fix listed | UBUNTU-CVE-2023-37457 |
| Ubuntu:26.10 | asterisk | no fix listed | UBUNTU-CVE-2023-37457 |
Affected products (as reported)
Weakness: CWE-120 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H