Stack Buffer Overflow in PHP Phar File Loading Could Lead to Memory Corruption or RCE

CVE-2023-3824

What is CVE-2023-3824?

CVE-2023-3824 is a significant vulnerability affecting the PHP programming language, specifically versions 8.0.* prior to 8.0.30, 8.1.* prior to 8.1.22, and 8.2.* prior to 8.2.8. This vulnerability arises when the PHP interpreter processes PHAR (PHP Archive) files, where insufficient length checking can trigger a stack buffer overflow. Such an overflow can compromise memory integrity, potentially leading to arbitrary code execution (RCE). Organizations using affected PHP versions could face severe consequences if an attacker exploits this vulnerability, as it can facilitate unauthorized access to systems and sensitive data.

Technical Details

The vulnerability is rooted in the handling of PHAR directory entries during the loading of PHAR files. A lack of proper checks on the lengths of these entries could allow an attacker to overflow a buffer, which may corrupt memory. This technical flaw is particularly concerning in environments where PHP applications widely rely on PHAR archives for packaging and distribution of code. The affected PHP versions are prevalent in various web applications, making this vulnerability a notable risk across many installations.

Potential impact of CVE-2023-3824

1. Remote Code Execution (RCE): The most critical impact of CVE-2023-3824 is the potential for attackers to execute arbitrary code remotely. This could lead to complete control of the affected systems, facilitating further malicious activities.

2. Memory Corruption: The stack buffer overflow can lead to memory corruption, causing instability in applications using PHP and potentially compromising system integrity. This can result in application crashes or unintended behaviors that could be exploited further.

3. Data Breaches: Given PHP's extensive use in web applications, an exploited vulnerability could expose sensitive information stored in databases or application configurations, leading to data breaches and loss of customer trust.

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