Buffer overflow in Asterisk
CVE-2023-37457
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.
Vulnerability class: Buffer Overflow
EPSS: 0.011 (63.0th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
Affected products
- Asterisk — versions <= 18.20.0, >= 19.0.0, <= 20.5.0, = 21.0.0
- Digium Asterisk — versions 21.0.0
- Sangoma Certified_asterisk — versions 13.13.0, 16.8.0, 18.9
Weakness classification (CWE)
Public proof-of-concept exploits
References
- security-advisories@github.com (x_refsource_CONFIRM, Vendor Advisory)
- security-advisories@github.com (Patch, x_refsource_MISC)
- security-advisories@github.com
Frequently asked questions
- What is CVE-2023-37457?
- CVE-2023-37457 is a high-severity vulnerability in Asterisk, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 7.5/10. Published 2023-12-14.
- How severe is CVE-2023-37457?
- High severity. CVSS v3 base score is 7.5 out of 10.
- Is CVE-2023-37457 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.