CVE-2023-34319 Linux: buffer overrun in netback due to unusual packet
A buffer overrun in the Linux netback driver allows attackers to cause denial of service or execute code via specially crafted network packets.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2023-34319?
CVE-2023-34319 is a high-severity memory corruption vulnerability in Debian Debian Linux, published on 22 Sep 2023. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
The fix for XSA-423 added logic to Linux'es netback driver to deal with a frontend splitting a packet in a way such that not all of the headers would come in one piece. Unfortunately the logic introduced there didn't account for the extreme case of the entire packet being split into as many pieces as permitted by the protocol, yet still being smaller than the area that's specially dealt with to keep all (possible) headers together. Such an unusual packet would therefore trigger a buffer overrun in the driver.
Weakness: CWE-787
Which versions are affected by CVE-2023-34319?
It affects 3 products.
Products include Debian Debian Linux, Linux kernel, Xen Xen.
How do I fix CVE-2023-34319?
Apply the vendor's patch.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2023-34319 being exploited?
There is no known exploitation of CVE-2023-34319 in the wild and no public exploit code.
Other vulnerabilities in Debian Debian Linux
Sources
Also known as DEBIAN-CVE-2023-34319, UBUNTU-CVE-2023-34319.