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CVE-2021-41281— Path traversal in Matrix Synapse

Quick assessment

Affected
matrix-org synapse
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.

synapse是一个应用程序。用于开放式联合即时消息和VoIP Synapse package 1.47.1之前版本存在路径遍历漏洞，攻击者可利用该漏洞绕过身份验证过程，从远程服务器下载文件到任意目录中。

CVSS 7.5 · High EPSS 1.58% · P75

Possible ATT&CK Techniques 1 AI

T1105 · Ingress Tool Transfer
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I. Basic Information for CVE-2021-41281

Vulnerability Information
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Vulnerability Title
Path traversal in Matrix Synapse
Source: CVE Program / CVE List V5
Vulnerability Description
Synapse is a package for Matrix homeservers written in Python 3/Twisted. Prior to version 1.47.1, Synapse instances with the media repository enabled can be tricked into downloading a file from a remote server into an arbitrary directory. No authentication is required for the affected endpoint. The last 2 directories and file name of the path are chosen randomly by Synapse and cannot be controlled by an attacker, which limits the impact. Homeservers with the media repository disabled are unaffected. Homeservers with a federation whitelist are also unaffected, since Synapse will check the remote hostname, including the trailing `../`s, against the whitelist. Server administrators should upgrade to 1.47.1 or later. Server administrators using a reverse proxy could, at the expense of losing media functionality, may block the certain endpoints as a workaround. Alternatively, non-containerized deployments can be adapted to use the hardened systemd config.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
对路径名的限制不恰当(路径遍历)
Source: CVE Program / CVE List V5
Vulnerability Title
synapse 路径遍历漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
synapse是一个应用程序。用于开放式联合即时消息和VoIP Synapse package 1.47.1之前版本存在路径遍历漏洞，攻击者可利用该漏洞绕过身份验证过程，从远程服务器下载文件到任意目录中。
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 synapse < 1.47.1 -

II. Public POCs for CVE-2021-41281

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III. Intelligence Information for CVE-2021-41281

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Patches & Fixes for CVE-2021-41281 (1)

Vendor Advisories for CVE-2021-41281 (1)

Mailing List Discussions for CVE-2021-41281 (2)

Other References for CVE-2021-41281 (1)

IV. Related Vulnerabilities

Same product: synapse
Same vendor: matrix-org
Same weakness: CWE-22

V. Comments for CVE-2021-41281

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