CVE-2023-38700: Exposure of Sensitive Information to an Unauthorized Actor

August 4, 2023 (updated August 10, 2023)

matrix-appservice-irc is a Node.js IRC bridge for Matrix. Prior to version 1.0.1, it was possible to craft an event such that it would leak part of a targeted message event from another bridged room. This required knowing an event ID to target. Version 1.0.1n fixes this issue. As a workaround, set the matrixHandler.eventCacheSize config value to 0. This workaround may impact performance.

References

github.com/matrix-org/matrix-appservice-irc/commit/8bbd2b69a16cbcbeffdd9b5c973fd89d61498d75
github.com/matrix-org/matrix-appservice-irc/releases/tag/1.0.1
github.com/matrix-org/matrix-appservice-irc/security/advisories/GHSA-c7hh-3v6c-fj4q
nvd.nist.gov/vuln/detail/CVE-2023-38700

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