CVE-2023-39957 : Vulnerability Insights and Analysis

A path traversal vulnerability in the Nextcloud Talk Android app allows attackers to write files into the root directory. This CVE has a CVSS base score of 7.2.

Understanding CVE-2023-39957

Nextcloud Talk Android app is vulnerable to path traversal, enabling the writing of files to unauthorized directories.

What is CVE-2023-39957?

Nextcloud Talk Android, before version 17.0.0, is susceptible to tricking the app into writing files outside its designated cache folder due to an unprotected intent.

The Impact of CVE-2023-39957

This high-severity vulnerability in Nextcloud Talk Android can lead to unauthorized file writing by malicious third-party apps, potentially compromising confidentiality, integrity, and availability of data.

Technical Details of CVE-2023-39957

The vulnerability stems from improper limitation of a pathname, allowing path traversal attacks.

Vulnerability Description

The flaw in Nextcloud Talk Android permits attackers to write files outside the intended cache directory, leveraging a path traversal technique.

Affected Systems and Versions

Vendor: Nextcloud
Product: Talk Android
Versions Affected: < 17.0.0

Exploitation Mechanism

Malicious third-party apps can exploit an unprotected intent to deceive the Talk Android app into writing files in unauthorized locations.

Mitigation and Prevention

To safeguard against CVE-2023-39957, immediate patching and adopting secure coding practices are essential.

Immediate Steps to Take

Update Nextcloud Talk Android to version 17.0.0 or later to mitigate the vulnerability. Ensure all app installations are from trusted sources.

Long-Term Security Practices

Regularly monitor security advisories, conduct security assessments, and educate users on safe app usage practices.

Patching and Updates

Stay informed about security patches released by Nextcloud and promptly apply updates to eliminate vulnerabilities.