CVE-2017-17448 Missing authorization in n/a
Local users can bypass access restrictions in the Linux kernel netfilter subsystem due to missing capability checks on netlink operations.
- 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-2017-17448?
CVE-2017-17448 is a high-severity missing authorization vulnerability in Linux kernel, published on 7 Dec 2017. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
net/netfilter/nfnetlink_cthelper.c in the Linux kernel through 4.14.4 does not require the CAP_NET_ADMIN capability for new, get, and del operations, which allows local users to bypass intended access restrictions because the nfnl_cthelper_list data structure is shared across all net namespaces.
Weakness: CWE-862
Which versions are affected by CVE-2017-17448?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2017-17448?
Apply the vendor's patch.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2017-17448 being exploited?
There is no known exploitation of CVE-2017-17448 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as DEBIAN-CVE-2017-17448, GHSA-q8pc-q7mj-47x6, UBUNTU-CVE-2017-17448.