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CVE-2023-38700— matrix-appservice-irc events can be crafted to leak parts of targeted messages from other bridged rooms

Quick assessment

Affected
matrix-org matrix-appservice-irc
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.

matrix-appservice-irc是Matrix的一款网桥。这个网桥会将所有 IRC 消息传递给 Matrix，并将所有 Matrix 消息传递给 IRC。 matrix-appservice-irc 1.0.1之前版本存在信息泄露漏洞，该漏洞源于允许攻击者通过制作消息事件来获取另一个桥接房间的信息。

CVSS 3.5 · Low EPSS 0.60% · P47

Possible ATT&CK Techniques 1 AI

T1014 · Rootkit
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I. Basic Information for CVE-2023-38700

Vulnerability Information
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Vulnerability Title
matrix-appservice-irc events can be crafted to leak parts of targeted messages from other bridged rooms
Source: CVE Program / CVE List V5
Vulnerability Description
matrix-appservice-irc is a Node.js IRC bridge for Matrix. Prior to version 1.0.1, it was possible to craft an event such that it would leak part of a targeted message event from another bridged room. This required knowing an event ID to target. Version 1.0.1n fixes this issue. As a workaround, set the `matrixHandler.eventCacheSize` config value to `0`. This workaround may impact performance.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
信息暴露
Source: CVE Program / CVE List V5
Vulnerability Title
matrix-appservice-irc 信息泄露漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
matrix-appservice-irc是Matrix的一款网桥。这个网桥会将所有 IRC 消息传递给 Matrix，并将所有 Matrix 消息传递给 IRC。 matrix-appservice-irc 1.0.1之前版本存在信息泄露漏洞，该漏洞源于允许攻击者通过制作消息事件来获取另一个桥接房间的信息。
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
matrix-org matrix-appservice-irc < 1.0.1 -

II. Public POCs for CVE-2023-38700

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III. Intelligence Information for CVE-2023-38700

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Patches & Fixes for CVE-2023-38700 (1)

Vendor Advisories for CVE-2023-38700 (1)

Other References for CVE-2023-38700 (1)

Same Patch Batch · matrix-org · 2023-08-04 · 4 CVEs total

CVE-2023-38686 9.3 CRITICAL Sydent does not verify email server certificates
CVE-2023-38690 5.8 MEDIUM matrix-appservice-irc IRC command injection via admin commands containing newlines
CVE-2023-38691 5.0 MEDIUM matrix-appservice-bridge doesn't verify the sub parameter of an openId token exhange, allo

IV. Related Vulnerabilities

Same product: matrix-appservice-irc
Same vendor: matrix-org
Same weakness: CWE-200

V. Comments for CVE-2023-38700

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