Vulnerability · Published Feb 13, 2025 · Assigned by GitHub_M
CVE-2025-25195Zulip events can leak private channel names
Medium 4.3
In plain English
A medium-severity information exposure in zulip from zulip. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 31% of all known vulnerabilities).
Official description
Zulip is an open source team chat application. A weekly cron job (added in 50256f48314250978f521ef439cafa704e056539) demotes channels to being "inactive" after they have not received traffic for 180 days. However, upon doing so, an event was sent to all users in the organization, not just users in the channel. This event contained the name of the private channel. Similarly, the same commit (50256f48314250978f521ef439cafa704e056539) added functionality to notify clients when channels stopped being "inactive." The first message sent to a private channel which had not previously had any messages for over 180 days (and were thus already marked "inactive") would leak an event to all users in the organization; this event also contained the name of the private channel. Commits 75be449d456d29fef27e9d1828bafa30174284b4 and a2a1a7f8d152296c8966f1380872c0ac69e5c87e fixed the issue. This vulnerability only existed in `main`, and was not part of any published versions.
Affected products (as reported)
Weakness: CWE-200 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
References
- https://github.com/zulip/zulip/security/advisories/GHSA-x8cx-3hq5-4wj9 x_refsource_CONFIRM
- https://github.com/zulip/zulip/commit/50256f48314250978f521ef439cafa704e056539 x_refsource_MISC
- https://github.com/zulip/zulip/commit/75be449d456d29fef27e9d1828bafa30174284b4 x_refsource_MISC
- https://github.com/zulip/zulip/commit/a2a1a7f8d152296c8966f1380872c0ac69e5c87e x_refsource_MISC