full-disclosure - [FD] [Full Disclosure] CVE-2024-22899: Unpatched Command Injection in Vinchin Backup and Recovery Versions 7.2 and Earlier

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Message-ID: <foUERLutgWK21zUA6XEIToLcbFASxA7r8Do9zF_A7KrGrDnxpLiZpzKdP5QEOm6MNSYmg1b65_pZcPYCsbSNG1IbWKCH-Ij-7JwSDGoKMhk=@protonmail.com>
Date: Thu, 25 Jan 2024 19:19:30 +0000
From: Valentin Lobstein via Fulldisclosure <fulldisclosure@...lists.org>
To: "fulldisclosure@...lists.org" <fulldisclosure@...lists.org>
Subject: [FD] [Full Disclosure] CVE-2024-22899: Unpatched Command Injection
	in Vinchin Backup and Recovery Versions 7.2 and Earlier

CVE ID: CVE-2024-22899

Title: Command Injection Vulnerability in Vinchin Backup and Recovery's syncNtpTime Function in Versions 7.2 and Earlier

Description:
A critical security vulnerability, identified as CVE-2024-22899, has been discovered in the `syncNtpTime` function of Vinchin Backup and Recovery software. This issue affects versions 7.2 and earlier. The function, part of the `SystemHandler.class.php` file, is designed for synchronizing system time with NTP servers but is prone to a command injection vulnerability due to improper handling of user input.

Function Analysis:
- The function is responsible for handling the `ntphost` parameter, which is expected to contain the address of the NTP server.
- The vulnerability stems from the direct concatenation of this parameter into a system command line, without adequate validation or sanitization.
- This design flaw allows an attacker to inject arbitrary commands into the `ntphost` parameter, which are then executed by the system.

Current Status:
As of now, there is no patch available for this vulnerability in versions 7.2 and earlier of Vinchin Backup and Recovery. Users of these versions are at risk of exploitation.

Recommendation:
It is advised for users of Vinchin Backup and Recovery versions 7.2 and earlier to remain alert and monitor for updates from Vinchin. Once a patch becomes available, it should be applied immediately to mitigate the risk posed by this vulnerability.

Conclusion:
The discovery of CVE-2024-22899 underscores the importance of rigorous input validation and sanitization in software development. This vulnerability poses a severe security risk, potentially leading to unauthorized system access or control.

Signed,Valentin Lobstein
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