Vulnerability identifier: #VU31395

Vulnerability 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

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Zulip Server
Web applications / Other software

Vendor: Zulip

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

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

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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.