Information disclosure in Zulip Server

1) Permissions, Privileges, and Access Controls

EUVDB-ID: #VU65857

Risk: Medium

CVSSv4.0: 4.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2022-31134

CWE-ID: CWE-264 - Permissions, Privileges, and Access Controls

Exploit availability: No

Description

The vulnerability allows a remote user to gain access to sensitive information.

The vulnerability exists due to improper privilege management in the export public data feature. As a result, all privately uploaded files were made accessible during export, including files from private messages.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Zulip Server: 2.1.0 - 5.3

CPE2.3

• cpe:2.3:a:zulip:zulip_server:2.1.0:*:*:*:*:*:*:*
• cpe:2.3:a:zulip:zulip_server:2.1.1:*:*:*:*:*:*:*
• cpe:2.3:a:zulip:zulip_server:2.1.2:*:*:*:*:*:*:*

External links

https://blog.zulip.com/2022/07/12/zulip-cloud-data-exports
https://github.com/zulip/zulip/security/advisories/GHSA-58pm-88xp-7x9m
https://blog.zulip.com/2022/07/12/zulip-server-5-4-security-release

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.