CVE-2010-4020 Weak cryptography in n/a

Medium 6.3 Published 2 Dec 2010 Updated 7 Aug 2024

Remote authenticated users can forge Kerberos signatures due to weak RC4 key derivation, potentially gaining privileges.

Exploited in the wild: Not known
Login needed: Any signed-in user
Attackable: Over the internet
Victim action needed: Not needed
Fix: Available

What is CVE-2010-4020?

CVE-2010-4020 is a medium-severity vulnerability in Mit Kerberos 5, published on 2 Dec 2010. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

MIT Kerberos 5 (aka krb5) 1.8.x through 1.8.3 does not reject RC4 key-derivation checksums, which might allow remote authenticated users to forge a (1) AD-SIGNEDPATH or (2) AD-KDC-ISSUED signature, and possibly gain privileges, by leveraging the small key space that results from certain one-byte stream-cipher operations.

Weakness: CWE-310

Which versions are affected by CVE-2010-4020?

It affects 1 product.

Products include Mit Kerberos 5.

How do I fix CVE-2010-4020?

Apply the vendor's patch.

Is CVE-2010-4020 being exploited?

There is no known exploitation of CVE-2010-4020 in the wild and no public exploit code.

All Mit Kerberos 5 vulnerabilities

Sources

Also known as DEBIAN-CVE-2010-4020, GHSA-27hw-qqm8-6prm.