Medium severity · published Mar 28, 2017
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…
4.3
CVSS
1.1%
EPSS
No
On KEV
Description
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.
CVSS vector
CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
Low
Integrity
None
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)1.1% · higher than 66% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
ZS
Zulip Server Versions 1.4.2 and below ·
Zulip Server Versions 1.4.2 and below · source: vendor
ZS
Zulip Server · Zulip
before 1.4.3 · source: NVD
Affected product
ZS
Zulip Server Versions 1.4.2 and below
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2017-0881
CVE.org
https://www.cve.org/CVERecord?id=CVE-2017-0881
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