Description
The m_sasl module in InspIRCd before 2.0.23, when used with a service that supports SASL_EXTERNAL authentication, allows remote attackers to spoof certificate fingerprints and consequently log in as another user via a crafted SASL message.
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 13 | inspircd | 2.0.23-1 | — |
| Debian 12 | inspircd | 2.0.23-1 | — |
| Debian 8 | inspircd | 2.0.17-1+deb8u2 | DSA-3662-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 20.04 LTS | inspircd | 3.4.0-2ubuntu1+esm1 | USN-7405-1 |
| Ubuntu Pro 18.04 LTS | inspircd | 2.0.24-1ubuntu1+esm1 | USN-7405-1 |
| Ubuntu Pro 16.04 LTS | inspircd | 2.0.20-5ubuntu0.1~esm1 | USN-7405-1 |
Advisories 2
- USN-7405-1 inspircd vulnerabilities Ubuntu Security Notices (USN) · Jun 25, 2026
- DSA-3662-1 inspircd - security update Debian Security (DSA / DLA) · Mar 9, 2026
References
- http://www.inspircd.org/2016/09/03/v2023-released.html
- https://github.com/inspircd/inspircd/commit/74fafb7f11b06747f69f182ad5e3769b665eea7a
- [oss-security] 20160905 Re: CVE ID request: certificate spoofing through crafted SASL message in inspircd, charybdis mailing-list
- [oss-security] 20160904 CVE ID request: certificate spoofing through crafted SASL message in inspircd, charybdis mailing-list
- DSA-3662 vendor-advisory