CVE-2007-6627 in Feng
Summary
by MITRE
Integer overflow in the RTSP_remove_msg function in RTSP_lowlevel.c in LScube Feng 0.1.15 and earlier allows remote attackers to cause a denial of service (crash) and possibly execute arbitrary code via an RTP packet with a size value of 0xffff.
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Analysis
by VulDB Data Team • 09/14/2018
The vulnerability identified as CVE-2007-6627 represents a critical integer overflow flaw within the LScube Feng streaming media server version 0.1.15 and earlier. This issue resides in the RTSP_remove_msg function located in the RTSP_lowlevel.c source file, which processes real-time streaming protocol messages. The vulnerability manifests when the system receives an RTP packet containing a size value of 0xffff, which translates to 65535 in decimal, triggering a catastrophic overflow condition that can lead to system instability and potential code execution.
The technical mechanism behind this vulnerability operates through improper input validation and arithmetic handling within the RTSP protocol processing layer. When the RTSP_remove_msg function processes an RTP packet with the maximum 16-bit unsigned integer value as its size parameter, the subsequent mathematical operations fail to properly handle the overflow condition. This integer overflow creates a situation where the calculated buffer size or memory allocation parameters exceed the system's capacity to handle them, leading to unpredictable behavior in the memory management subsystem. The flaw aligns with CWE-190, which specifically addresses integer overflow and underflow conditions that can result in memory corruption and arbitrary code execution.
The operational impact of this vulnerability extends beyond simple denial of service to potentially enable remote code execution, making it particularly dangerous for networked media streaming environments. Attackers can exploit this weakness by crafting malicious RTP packets with the specific size value of 0xffff, which when processed by the vulnerable server, causes the application to crash or potentially execute unintended code. This capability allows threat actors to gain unauthorized access to the system, potentially leading to complete compromise of the streaming server and associated network infrastructure. The vulnerability demonstrates the critical importance of input validation in network protocol implementations, as highlighted by ATT&CK technique T1203, which covers the exploitation of input validation flaws for privilege escalation and code execution.
Mitigation strategies for this vulnerability require immediate patching of the LScube Feng software to version 0.1.16 or later, which contains the necessary fixes for the integer overflow condition. Organizations should implement network segmentation and access controls to limit exposure of vulnerable systems to untrusted networks. Additionally, deploying intrusion detection systems that can identify and block RTP packets with suspicious size values provides an additional layer of defense. Security monitoring should focus on detecting unusual memory allocation patterns and process crashes that may indicate exploitation attempts. The vulnerability underscores the necessity of robust integer handling in network protocol implementations and emphasizes the importance of adhering to secure coding practices as recommended by industry standards such as the CERT C Secure Coding Standard and OWASP secure coding guidelines.