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

Quick assessment

Affected
zulip zulip
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Zulip是Zulip团队的一款功能强大的开源群聊应用程序。用于将实时聊天的即时性与线程对话的生产力优势相结合。 Zulip存在安全漏洞，该漏洞源于可以发送消息的攻击者可以发送一个精心制作的URL欺骗服务器直接嵌入远程图像引用，导致攻击者推断查看者的IP地址和浏览器指纹信息。

CVSS 4.3 · Medium EPSS 0.63% · P48

Possible ATT&CK Techniques 1 AI

T1115 · Clipboard Data
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I. Basic Information for CVE-2022-36048

Vulnerability Information
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Vulnerability Title
IP address leak via image proxy bypass in Zulip Server
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
解释冲突
Source: CVE Program / CVE List V5
Vulnerability Title
Zulip 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Zulip是Zulip团队的一款功能强大的开源群聊应用程序。用于将实时聊天的即时性与线程对话的生产力优势相结合。 Zulip存在安全漏洞，该漏洞源于可以发送消息的攻击者可以发送一个精心制作的URL欺骗服务器直接嵌入远程图像引用，导致攻击者推断查看者的IP地址和浏览器指纹信息。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
zulip zulip < 5.6 -

II. Public POCs for CVE-2022-36048

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III. Intelligence Information for CVE-2022-36048

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Vendor Advisories for CVE-2022-36048 (1)

IV. Related Vulnerabilities

Same product: zulip
Same vendor: zulip
Same weakness: CWE-436

V. Comments for CVE-2022-36048

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