CVE-2023-35965 in YF325
Summary
by MITRE • 10/25/2023
Two heap-based buffer overflow vulnerabilities exist in the httpd manage_post functionality of Yifan YF325 v1.0_20221108. A specially crafted network request can lead to a heap buffer overflow. An attacker can send a network request to trigger these vulnerabilities.This integer overflow result is used as argument for the malloc function.
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Analysis
by VulDB Data Team • 10/25/2023
The vulnerability identified as CVE-2023-35965 represents a critical heap-based buffer overflow in the Yifan YF325 v1.0_20221108 web server implementation. This flaw specifically manifests within the httpd manage_post functionality, which processes incoming network requests containing POST data. The vulnerability stems from improper input validation and memory allocation handling that occurs when processing crafted network requests. The flaw allows an attacker to manipulate the application's memory management by exploiting an integer overflow condition that directly influences the malloc function parameters. This integer overflow occurs when the application processes user-supplied data without adequate bounds checking, leading to a scenario where the calculated memory allocation size exceeds the intended buffer boundaries. The vulnerability is particularly concerning because it allows for arbitrary memory corruption that can potentially lead to remote code execution or system compromise.
The technical implementation of this vulnerability follows a classic heap overflow pattern where an attacker can manipulate input data to cause the malloc function to allocate insufficient memory for the intended data structure. When the application processes a specially crafted POST request, the integer overflow results in a memory allocation that does not properly account for the actual data size required. This creates a situation where subsequent memory operations can overwrite adjacent heap memory regions, potentially corrupting critical data structures or execution pointers. The vulnerability's exploitation requires the attacker to send a specific network request that triggers the problematic code path within the httpd manage_post functionality. The integer overflow condition directly feeds into the malloc allocation size, creating a scenario where the allocated heap memory is insufficient to contain the data being written, thus enabling the buffer overflow condition.
The operational impact of CVE-2023-35965 extends beyond simple memory corruption as it provides a potential pathway for complete system compromise. The heap-based nature of the vulnerability means that attackers can potentially overwrite critical heap metadata structures, leading to denial of service conditions or more severe exploitation scenarios. The vulnerability's remote exploitability through network requests makes it particularly dangerous in environments where the affected web server is accessible from external networks. An attacker could leverage this vulnerability to execute arbitrary code on the affected system, potentially gaining unauthorized access to sensitive data or establishing persistent access. The implications are further amplified by the fact that this vulnerability affects a web server implementation that may be deployed in critical infrastructure environments, where unauthorized access could lead to significant operational disruptions or security breaches.
Security mitigations for CVE-2023-35965 should focus on immediate patching of the affected Yifan YF325 firmware to address the integer overflow condition in the malloc function call. Organizations should implement network segmentation and access controls to limit exposure of affected devices to untrusted networks. Input validation controls should be strengthened to prevent malformed POST data from reaching the vulnerable code path, including implementing proper bounds checking and size validation for all user-supplied data. The vulnerability aligns with CWE-121 heap-based buffer overflow and follows ATT&CK technique T1210 for exploitation through memory corruption. Regular security assessments should be conducted to identify similar patterns in other network services, and implementing address space layout randomization (ASLR) and stack canaries can provide additional defense-in-depth measures against exploitation attempts. System monitoring should be enhanced to detect anomalous network traffic patterns that may indicate exploitation attempts against this vulnerability.