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CVE-2021-41181— Nextcloud Talk app exposes chat messages on lockscreen

Quick assessment

Affected
nextcloud security-advisories
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.

Nextcloud Talk是德国Nextcloud公司的一款自托管的本地音频/视频和聊天通信服务。 Nextcloud Talk 存在授权问题漏洞，该漏洞源于在 12.3.0 之前的版本中，Nextcloud Android Talk 应用程序在来电时无法正确检测到锁屏状态。 如果攻击者可以物理访问锁定的电话，并且受害者接到电话，则攻击者可以访问用户的聊天消息和文件。

CVSS 2.4 · Low EPSS 0.31% · P22

Possible ATT&CK Techniques 1 AI

T1528 · Steal Application Access Token
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I. Basic Information for CVE-2021-41181

Vulnerability Information
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Vulnerability Title
Nextcloud Talk app exposes chat messages on lockscreen
Source: CVE Program / CVE List V5
Vulnerability Description
Nextcloud talk is a self hosting messaging service. In versions prior to 12.3.0 the Nextcloud Android Talk application did not properly detect the lockscreen state when a call was incoming. If an attacker got physical access to the locked phone, and the victim received a phone call the attacker could gain access to the chat messages and files of the user. It is recommended that the Nextcloud Android Talk App is upgraded to 12.3.0. There are no known workarounds.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/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
Nextcloud Talk 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Nextcloud Talk是德国Nextcloud公司的一款自托管的本地音频/视频和聊天通信服务。 Nextcloud Talk 存在授权问题漏洞，该漏洞源于在 12.3.0 之前的版本中，Nextcloud Android Talk 应用程序在来电时无法正确检测到锁屏状态。 如果攻击者可以物理访问锁定的电话，并且受害者接到电话，则攻击者可以访问用户的聊天消息和文件。
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
nextcloud security-advisories < 12.3.0 -

II. Public POCs for CVE-2021-41181

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III. Intelligence Information for CVE-2021-41181

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Patches & Fixes for CVE-2021-41181 (1)

Vendor Advisories for CVE-2021-41181 (1)

Same Patch Batch · nextcloud · 2022-03-08 · 4 CVEs total

CVE-2021-41239 5.3 MEDIUM User enumeration setting not respected in Nextcloud server
CVE-2021-41180 4.7 MEDIUM Geolocation preview links can be set to arbitrary links in nextcloud talk
CVE-2021-41241 4.3 MEDIUM Advanced permissions is not respected for subfolders in Nextcloud server

IV. Related Vulnerabilities

Same product: security-advisories
Same vendor: nextcloud
Same weakness: CWE-200

V. Comments for CVE-2021-41181

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