CVE-2024-9129 in Server
Summary
by MITRE • 10/22/2024
In versions of Zend Server 8.5 and prior to version 9.2 a format string injection was discovered.
Reported by Dylan Marino
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Analysis
by VulDB Data Team • 10/22/2024
The vulnerability identified as CVE-2024-9129 represents a critical format string injection flaw within Zend Server versions 8.5 and earlier, with the issue persisting until version 9.1. This security weakness resides in the application server's handling of user-supplied input that is subsequently processed through format string functions. The vulnerability stems from improper validation and sanitization of input parameters that are directly incorporated into format string operations without adequate escaping or encoding mechanisms.
Format string injection vulnerabilities occur when application code uses user-controllable data as format strings in functions such as printf, sprintf, or similar string formatting routines. In the context of Zend Server, this flaw allows attackers to manipulate the format string parsing mechanism by injecting malicious format specifiers and conversion characters. The vulnerability manifests when user input flows into functions that expect literal format strings rather than user-controlled data, creating opportunities for arbitrary code execution, information disclosure, or denial of service conditions. This type of vulnerability falls under the CWE-134 classification, which specifically addresses format string vulnerabilities where format strings are constructed from untrusted input.
The operational impact of CVE-2024-9129 extends significantly across multiple attack vectors and system components. An attacker exploiting this vulnerability could potentially execute arbitrary code on the affected server with the privileges of the web application process, leading to complete system compromise. The vulnerability may also enable information disclosure attacks where attackers can read sensitive memory contents, potentially exposing database credentials, session tokens, or other confidential data. Additionally, the flaw could facilitate denial of service conditions by causing application crashes or infinite loops through malformed format strings. The attack surface includes any application component that processes user input through format string operations within the Zend Server environment, making this vulnerability particularly dangerous in production environments where the server handles sensitive data processing tasks.
Mitigation strategies for CVE-2024-9129 should prioritize immediate patching of affected Zend Server installations to version 9.2 or later, where the vulnerability has been addressed through proper input validation and sanitization mechanisms. Organizations should implement comprehensive input validation at all entry points where user data interacts with format string functions, ensuring that all user-supplied input is properly escaped or encoded before being processed. Security monitoring should include detection of suspicious format string patterns in application logs and network traffic analysis to identify potential exploitation attempts. The implementation of web application firewalls and runtime application self-protection technologies can provide additional layers of defense against exploitation attempts. System administrators should also conduct thorough security assessments of applications running on affected Zend Server versions to identify and remediate any other potential format string vulnerabilities within their codebase. This vulnerability aligns with ATT&CK technique T1059.007 for command and script injection, and T1566 for phishing attacks that may leverage such vulnerabilities for initial access, making comprehensive security measures essential for protecting against both direct exploitation and related attack chains.