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CVE-2023-39957— Path traversal allows tricking the Talk Android app into writing files into it's root directory

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 17.0.0之前版本存在路径遍历漏洞。攻击者利用该漏洞在其预期缓存目录之外写入文件。

AI Predicted 6.5 Difficulty: Easy EPSS 0.37% · P28

Possible ATT&CK Techniques 1 AI

T1059 · Command and Scripting Interpreter
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I. Basic Information for CVE-2023-39957

Vulnerability Information
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Vulnerability Title
Path traversal allows tricking the Talk Android app into writing files into it's root directory
Source: CVE Program / CVE List V5
Vulnerability Description
Nextcloud Talk Android allows users to place video and audio calls through Nextcloud on Android. Prior to version 17.0.0, an unprotected intend allowed malicious third party apps to trick the Talk Android app into writing files outside of its intended cache directory. Nextcloud Talk Android version 17.0.0 has a patch for this issue. No known workarounds are available.
Source: CVE Program / CVE List V5
CVSS Information
N/A
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
Nextcloud Talk 路径遍历漏洞
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 17.0.0之前版本存在路径遍历漏洞。攻击者利用该漏洞在其预期缓存目录之外写入文件。
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 < 17.0.0 -

II. Public POCs for CVE-2023-39957

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III. Intelligence Information for CVE-2023-39957

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Patches & Fixes for CVE-2023-39957 (1)

Vendor Advisories for CVE-2023-39957 (1)

Other References for CVE-2023-39957 (1)

Same Patch Batch · nextcloud · 2023-08-10 · 10 CVEs total

CVE-2023-39963 8.1 HIGH Missing password confirmation when creating app passwords
CVE-2023-39962 7.7 HIGH Users can delete external storage mount points
CVE-2023-39952 6.5 MEDIUM Advanced permissions not respected when copying entire group folders
CVE-2023-39958 5.8 MEDIUM Missing brute force protection on password reset token OAuth2 API controller
CVE-2023-39953 4.8 MEDIUM Issuer not verified from obtained token in user_oidc
CVE-2023-39954 3.8 LOW user_oidc app stores client secret unencrypted in database
CVE-2023-39955 3.5 LOW Notes attachment render HTML in preview mode
CVE-2023-39959 3.5 LOW Existence of calendars and address books can be checked by unauthenticated users
CVE-2023-39961 3.5 LOW Text does not respect "Allow download" permissions

IV. Related Vulnerabilities

Same product: security-advisories
Same vendor: nextcloud
Same weakness: CWE-22

V. Comments for CVE-2023-39957

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