Arbitrary file upload in Zulip Server - CVE-2023-22735
Published: February 7, 2023
Vulnerability identifier: #VU72011
CSH Severity: Medium
CVSSv4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N/E:U/U:Green
CVE-ID: CVE-2023-22735
CWE-ID: CWE-434
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerable software:
Zulip Server
Zulip Server
Software vendor:
Zulip
Zulip
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.
Remediation
Install updates from vendor's website.
The vulnerability affects the main branch between 2023-01-09 and 2023-02-07.