SB2017032820 - Security restrictions bypass in Zulip Server
Published: March 28, 2017 Updated: July 28, 2022
Security Bulletin ID
SB2017032820
Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Information disclosure
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 security vulnerability.
1) Improper access control (CVE-ID: CVE-2017-0881)
The vulnerability allows a remote user to gain unauthorized access to otherwise restricted functionality.
The vulnerability exists due to improper access restrictions in the autosubscribe feature in the check_stream_exists route of the Zulip group chat application server. A remote user can bypass implemented security restrictions and subscribe to a private stream without the necessary invitation from the group member.
Remediation
Install update from vendor's website.