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Thelounge exposes user identities via port 113
published 2 years ago
Summary
Thelounge may reveal user usernames and connection information to anyone on the network. To protect user identities, disable identd or upgrade to a newer version of the software.
What to do
The CVE record does not list a fixed version. Check the vendor's site or the advisory links below - a fix may already be released.
Affected software
| Ecosystem | Vendor | Product | Affected versions |
|---|---|---|---|
| npm | theloungemaintainers | thelounge | <= 4.4.3 |
Original advisory text
thelounge may publicly disclose of all usernames/idents via port 113
Per RFC 1413, The unique identifying tuple includes not only the ports, but also the both addresses. Without the addresses, the information becomes both non-unique and public:
- If multiple connections happen to use the same local port number (which is possible if the addresses differ), the username of the first is returned for all, resulting in the wrong ident for all but the first.
- By not checking the connection address, the information becomes public. Because there is only a relatively small number of local ports, and the remote ports are likely to be either 6667 or 6697, it becomes trivial to scan the entire range to get a list of idents.
To prevent this from happening, disable identd or upgrade to a non vulnerable version.
- If multiple connections happen to use the same local port number (which is possible if the addresses differ), the username of the first is returned for all, resulting in the wrong ident for all but the first.
- By not checking the connection address, the information becomes public. Because there is only a relatively small number of local ports, and the remote ports are likely to be either 6667 or 6697, it becomes trivial to scan the entire range to get a list of idents.
To prevent this from happening, disable identd or upgrade to a non vulnerable version.
Timeline
Published9 May 2024
Updated6 Mar 2026
First seen6 Mar 2026
Sources
GHSA-g49q-jw42-6x85 · GHSA
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