Asterisk: Possible RED T.140 Heap Buffer Overflow
- Published
- Last modified
- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean? →
- published
- Whether CISA lists it in its Known Exploited Vulnerabilities catalog: proof that attackers are using it.What do these mean? →
- Not listed in CISA KEV
- Fix
- Fixed in 20.20.1, 21.12.3, 22.10.1, 23.4.1, 20.7-cert11, and 1 more
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
Summary
Asterisk, an open source telephony toolkit, is affected only when its legacy chan_sip channel driver is installed and the textsupport option is enabled. An authenticated attacker could exploit a heap buffer overflow in T.140 RED handling using crafted packets, which could allow remote code execution or crash Asterisk.
Summarized by anthropic/claude-haiku-5.5. Verify details against the original sources.
Read the original description
Asterisk is an open source private branch exchange and telephony toolkit. In affected deployments, an authenticated attacker may cause a `T.140 RED` heap buffer overflow using carefully crafted packets, potentially allowing remote code execution or causing Asterisk to crash. The `chan_sip` channel driver must be installed and configured, and its `textsupport` option must be enabled; `textsupport` defaults to no. `The chan_sip driver was deprecated in Asterisk 20 and completely removed in all later versions.` Repository comparisons verify patch containment in Asterisk 20.20.1, 21.12.3, 22.10.1 and 23.4.1, and Certified Asterisk 20.7-cert11 and 22.8-cert3. The affected release-track scope remains unresolved: structured metadata includes later release tracks even though the advisory says the required `chan_sip` driver was removed there.
Timeline
- CVE published
- First seen by cve.now
Affected versions
- asterisk asterisk
fixed in 20.20.1; From 21.0.0-pre1 · fixed in 21.12.3; From 22.0.0-pre1 · fixed in 22.10.1; From 23.0.0-pre1 · fixed in 23.4.1
- asterisk certified-asterisk
fixed in 20.7-cert11; From 22.8-cert1-pre1 · fixed in 22.8-cert3