Auth bypass in Zulip Server
CVE-2017-0881
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.
Vulnerability class: Information Disclosure
Published · last modified .
CVSS v3 metric
CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N.
EPSS exploit prediction
EPSS: 0.011 (64.4th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 64th percentile — 64.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.011 · newest: 0.011 · change: 0.000
Affected products
- Zulip Server
- Zulip Server Versions 1.4.2 And Below — versions Zulip Server Versions 1.4.2 and below
Weakness classification (CWE)
Public proof-of-concept exploits
References
- www.securityfocus.com/bid/97159 (Third Party Advisory, vdb-entry, Vendor Advisory)
- groups.google.com/d/msg/zulip-announce/VyawgRuoY34/NTBwnTArGwAJ (Patch, Third Party Advisory, Release Notes)
- github.com/zulip/zulip/commit/7ecda1ac8e26d8fb3725e954b2dc4723dda2255f (Patch, Third Party Advisory)
Frequently asked questions
- What is CVE-2017-0881?
- CVE-2017-0881 is a medium-severity vulnerability in Zulip Server, classified under Information Disclosure. CVSS score: 4.3/10. Published 2017-03-28.
- How severe is CVE-2017-0881?
- Medium severity. CVSS v3 base score is 4.3 out of 10.
- Is CVE-2017-0881 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.