CVE-2009-4128 Auth bypass in n/a
Physically proximate attackers can bypass GRUB password authentication by submitting a single-character password, allowing unauthorized system access.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2009-4128?
CVE-2009-4128 is a high-severity authentication bypass vulnerability in n/a, published on 1 Dec 2009. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Official description
GNU GRand Unified Bootloader (GRUB) 2 1.97 only compares the submitted portion of a password with the actual password, which makes it easier for physically proximate attackers to conduct brute force attacks and bypass authentication by submitting a password whose length is 1.
Weakness: CWE-287
Which versions are affected by CVE-2009-4128?
It affects 1 product.
Products include Gnu Grub 2.
How do I fix CVE-2009-4128?
Apply the vendor's patch.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2009-4128 being exploited?
There is no known exploitation of CVE-2009-4128 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2009-4128, GHSA-prgr-9xf7-v9fw.