Improper Authentication in Zulip Server



Published: 2017-11-27 | Updated: 2020-07-17
Risk High
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2017-0910
CWE-ID CWE-287
Exploitation vector Network
Public exploit N/A
Vulnerable software
Subscribe 		Zulip Server
Web applications / Other software

Vendor Zulip

Security Bulletin

This security bulletin contains one high risk vulnerability.

1) Improper Authentication

EUVDB-ID: #VU31395

Risk: High

CVSSv3.1: 7.7 [CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2017-0910

CWE-ID: CWE-287 - Improper Authentication

Exploit availability: No

Description

The vulnerability allows a remote authenticated user to execute arbitrary code.

In Zulip Server before 1.7.1, on a server with multiple realms, a vulnerability in the invitation system lets an authorized user of one realm on the server create a user account on any other realm.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Zulip Server: 1.7.0

CPE2.3 External links

http://blog.zulip.org/2017/11/23/zulip-1-7-1-released/
http://github.com/zulip/zulip/commit/960d736e55cbb9386a68e4ee45f80581fd2a4e32


Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.



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