CVE-2022-36048 IP address leak via image proxy bypass in Zulip Server

What is CVE-2022-36048?

CVE-2022-36048 is a medium-severity vulnerability in zulip, published on 31 Aug 2022. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

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](https://zulip.com/help/allow-image-link-previews) are not affected.

Weakness: CWE-436

Which versions are affected by CVE-2022-36048?

It affects 1 product.

Products include Zulip Zulip.

How do I fix CVE-2022-36048?

No fix has been published for CVE-2022-36048 yet. Limit exposure of the affected software until one is available.

Is CVE-2022-36048 being exploited?

There is no known exploitation of CVE-2022-36048 in the wild and no public exploit code.

Other vulnerabilities in zulip

• CVE-2021-43799 RabbitMQ exposes ports with weak default secrets in Zulip Server High 8.6
• CVE-2022-35962 Crafted link in Zulip message can cause disclosure of credentials High 8.0
• CVE-2016-4427 Auth bypass in zulip High 7.5
• CVE-2021-3866 Cross-site Scripting (XSS) - Stored in zulip/zulip Medium 6.8
• CVE-2023-28623 Unauthorized user can register an account in specific configurations in Zulip Medium 6.5

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-vg5m-mf9x-j452.