Horizon Alert
Summary of the vulnerability and why it matters
This vulnerability in the Linux kernel's USB/IP subsystem allows a malicious server to cause a memory overwrite. When a USB/IP client receives a response from a server, a value indicating the number of packets can be manipulated to exceed the allocated buffer size. This can lead to instability and crashes.
- Can affect systems using USB/IP.
- A compromised server is required.
- Causes potential system crashes.
Attack Path
How an attacker could exploit the issue
A malicious USB/IP server could exploit this by sending a crafted response to a client. This response would contain a larger number of packets than the client originally expected, leading to a heap buffer overflow on the client. This could allow an attacker to overwrite critical memory structures on the vulnerable client system.
- Requires a malicious server.
- Vulnerable client action: receiving RET_SUBMIT.
- Server must control the client's network.
Live Threat
Current exploitation, exposure, and threat context
This vulnerability offers an attacker control over a USB/IP server to potentially cause a heap out-of-bounds write on the client. While this can lead to serious impacts like crashes or code execution, it requires the client to connect to a malicious server. Therefore, exploitation is more likely in targeted scenarios rather than widespread automated attacks.
- Requires client to connect to malicious server.
- Niche use case limits broad appeal.
- No publicly available exploit code observed.
Priority actions
Operational Fix
Recommended remediation, mitigation, and detection steps
Prioritize patching affected Linux kernels to mitigate heap out-of-bounds writes. If patching is delayed, focus on isolating systems that utilize the USB/IP client and monitoring for unusual USB/IP traffic, as a malicious server can exploit this vulnerability.
- Apply Linux kernel patches.
- Isolate USB/IP client systems.
- Monitor USB/IP traffic.
