CVE-2017-0881

low-risk
Published 2017-03-28

An error in the implementation of an autosubscribe feature in the check_stream_exists route of the Zulip group chat application server before 1.4.3 allowed an authenticated user to subscribe to a private stream that should have required an invitation from an existing member to join. The issue affects all previously released versions of the Zulip server.

Do I need to act?

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0.21% chance of exploitation
EPSS score — low exploit probability
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Not on CISA KEV list
No confirmed active exploitation reported to CISA
?
Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
4
CVSS 4.3/10 Medium
NETWORK / LOW complexity

Affected Products (1)

Affected Vendors

Zulip

References (6)

Third Party Advisory http://www.securityfocus.com/bid/97159
Patch https://github.com/zulip/zulip/commit/7ecda1ac8e26d8fb3725e954b2dc4723dda2255f
Patch https://groups.google.com/d/msg/zulip-announce/VyawgRuoY34/NTBwnTArGwAJ
Third Party Advisory http://www.securityfocus.com/bid/97159
Patch https://github.com/zulip/zulip/commit/7ecda1ac8e26d8fb3725e954b2dc4723dda2255f
Patch https://groups.google.com/d/msg/zulip-announce/VyawgRuoY34/NTBwnTArGwAJ
24
/ 100
low-risk
Severity 18/34 · Moderate
Exploitability 1/34 · Minimal
Exposure 5/34 · Minimal