CVE-2022-36048: IP address leak via image proxy bypass in Zulip Server
Zulip is an open-source team collaboration tool with topic-based threading that combines email and chat. When displaying messages with embedded remote images, Zulip normally loads the image preview via a go-camo proxy server. However, an attacker who can send messages could include a crafted URL that tricks the server into embedding a remote image reference directly. This could allow the attacker to infer the viewer’s IP address and browser fingerprinting information. This vulnerability is fixed in Zulip Server 5.6. Zulip organizations with image and link previews disabled are not affected.
Affected Software
Event History
Frequently Asked Questions
What is CVE-2022-36048?
CVE-2022-36048 is a vulnerability in Zulip, an open-source team collaboration tool, that allows an attacker to include a crafted URL in a message, leading to potential remote image loading bypass.
How does CVE-2022-36048 impact Zulip?
CVE-2022-36048 impacts Zulip by allowing attackers to bypass the go-camo proxy server and load remote images by including a crafted URL in messages.
What is the severity of CVE-2022-36048?
CVE-2022-36048 has a severity rating of medium, with a CVSS score of 4.3.
How can I fix CVE-2022-36048 in Zulip?
To fix CVE-2022-36048 in Zulip, update to version 5.6 or higher, as this vulnerability is fixed in that version.
Where can I find more information about CVE-2022-36048?
More information about CVE-2022-36048 can be found at the following reference: https://github.com/zulip/zulip/security/advisories/GHSA-vg5m-mf9x-j452