Description
Buffer overflow in the getnickuserhost function in BNC 2.8.9, and possibly other versions, allows remote IRC servers to execute arbitrary code via an IRC server response that contains many (1) ! (exclamation) or (2) @ (at sign) characters.
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 3.0 | bnc | 2.6.4-3.3 | DSA-595-1 |
Advisories 1
- DSA-595-1 bnc - buffer overflow Debian Security (DSA / DLA) · Mar 9, 2026
References
- http://security.lss.hr/en/index.php?page=details&ID=LSS-2004-11-03
- 20041110 BNC 2.8.9 remote buffer overflow mailing-list
- DSA-595 vendor-advisory
- 13149 third-party-advisory
- bnc-irc-getnickuserhost-bo(18013) vdb-entry
- 11647 vdb-entry