Dangerous file upload in Zulip Server



Published: 2023-02-07
Risk Medium
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2023-22735
CWE-ID CWE-434
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 medium risk vulnerability.

1) Arbitrary file upload

EUVDB-ID: #VU72011

Risk: Medium

CVSSv3.1:

CVE-ID: CVE-2023-22735

CWE-ID: CWE-434 - Unrestricted Upload of File with Dangerous Type

Exploit availability: No

Description

The vulnerability allows a remote user to perform XSS attacks.

The vulnerability exists due to application allows to upload files with arbitrary Content-Type. Such file will be served from the Zulip hostname with Content-Disposition: inline and no Content-Security-Policy header. A remote user can upload a malicious file and execute arbitrary Javascript in the victim's browser in security context of the website.

Mitigation

Install updates from vendor's website.

The vulnerability affects the main branch between 2023-01-09 and 2023-02-07.

Vulnerable software versions

Zulip Server: 6.1 - 6.1

CPE2.3 External links

http://github.com/zulip/zulip/security/advisories/GHSA-wm83-3764-5wqh


Q & A

Can this vulnerability be exploited remotely?

Is there known malware, which exploits this vulnerability?



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