Description
chan_sip.c in the SIP channel driver in Asterisk Open Source 1.6.x before 1.6.2.18.1 and 1.8.x before 1.8.4.3 does not properly handle '\0' characters in SIP packets, which allows remote attackers to cause a denial of service (memory corruption) or possibly have unspecified other impact via a crafted packet.
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | asterisk | 1:1.8.4.3-1 | — |
| Debian 6.0 | asterisk | 1:1.6.2.9-2+squeeze3 | DSA-2276-2, DSA-2276-1 |
| Debian 5.0 | asterisk | 1:1.4.21.2~dfsg-3+lenny3 | DSA-2276-2, DSA-2276-1 |
Advisories 2
- DSA-2276-2 asterisk - multiple issues Debian Security (DSA / DLA) · Mar 9, 2026
- DSA-2276-1 asterisk - multiple issues Debian Security (DSA / DLA) · Mar 9, 2026
References
- asterisk-sipsockread-dos(68203) vdb-entry
- 73307 vdb-entry
- 48431 vdb-entry
- http://downloads.asterisk.org/pub/security/AST-2011-008.html
- 45239 third-party-advisory
- http://downloads.asterisk.org/pub/security/AST-2011-008.diff
- DSA-2276 vendor-advisory
- FEDORA-2011-8914 vendor-advisory
- 45048 third-party-advisory
- 1025706 vdb-entry
- 45201 third-party-advisory