CVE-2017-3196 in Rawether Framework
Summary
by MITRE
PCAUSA Rawether framework does not properly validate BPF data, allowing a crafted malicious BPF program to perform operations on memory outside of its typical bounds on the driver's receipt of network packets. Local attackers can exploit this issue to execute arbitrary code with SYSTEM privileges.
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Analysis
by VulDB Data Team • 12/25/2024
The vulnerability identified as CVE-2017-3196 resides within the PCAUSA Rawether framework, a network driver component that facilitates raw packet capture and transmission capabilities. This flaw manifests in the improper validation of Berkeley Packet Filter (BPF) data structures, which are fundamental to packet filtering and network monitoring operations. The vulnerability represents a classic buffer overflow condition that occurs when the driver processes maliciously crafted BPF programs without adequate bounds checking mechanisms. The BPF virtual machine executes these programs to filter network traffic, but the lack of proper validation allows attackers to manipulate memory access patterns beyond intended boundaries. This weakness is particularly concerning as it operates at the kernel level within the network driver context, providing attackers with direct access to system memory and execution capabilities.
The technical exploitation of this vulnerability leverages the BPF interpreter's failure to validate memory access parameters when processing malicious BPF bytecode. Attackers can construct specific BPF programs that, when loaded into the driver's memory space, cause the interpreter to access memory locations outside the legitimate program boundaries. This memory corruption enables privilege escalation from user-level processes to kernel-level execution with SYSTEM privileges. The flaw aligns with CWE-125, which describes out-of-bounds read conditions, and CWE-787, which covers out-of-bounds write vulnerabilities. The vulnerability's impact is amplified by the fact that BPF programs are typically loaded with elevated privileges, and the driver operates in kernel space where memory access controls are more permissive. This allows attackers to bypass standard security mechanisms and execute arbitrary code with complete system control.
The operational impact of CVE-2017-3196 extends beyond simple privilege escalation, as it provides attackers with persistent access to the compromised system. Once exploited, the vulnerability enables complete system compromise, allowing attackers to install rootkits, modify system files, or establish backdoor access. The local nature of the attack means that any user with access to the system can potentially exploit this vulnerability, making it particularly dangerous in multi-user environments or systems with compromised accounts. Network administrators face significant challenges in detecting this exploitation since the malicious activity occurs at the kernel level and may not generate obvious network traffic patterns. The vulnerability also impacts the integrity of network monitoring tools that rely on Rawether framework components, as attackers can manipulate the packet capture process to hide their activities or redirect traffic. This type of vulnerability falls under the ATT&CK tactic of privilege escalation and persistence, specifically targeting the system's kernel-level security controls.
Mitigation strategies for CVE-2017-3196 require immediate patching of the PCAUSA Rawether framework components, as the vulnerability exists in the driver's BPF processing logic. Organizations should implement network segmentation and access controls to limit local user access to systems running affected drivers. The principle of least privilege should be enforced to prevent unauthorized users from loading malicious BPF programs. Regular system monitoring should include checks for unauthorized driver modifications or unexpected memory access patterns. System administrators should also consider disabling unnecessary BPF functionality when it is not required for network operations. Additionally, implementing kernel address space layout randomization and other exploit mitigation techniques can help reduce the effectiveness of exploitation attempts. The vulnerability highlights the importance of secure coding practices in kernel-level components and demonstrates the critical need for proper input validation and memory management in driver software. Organizations should conduct thorough vulnerability assessments of their network infrastructure to identify all systems running affected Rawether framework components and ensure timely remediation through official vendor patches.