### [CVE-2010-4020](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2010-4020)
![](https://img.shields.io/static/v1?label=Product&message=n%2Fa&color=blue)
![](https://img.shields.io/static/v1?label=Version&message=n%2Fa&color=blue)
![](https://img.shields.io/static/v1?label=Vulnerability&message=n%2Fa&color=brighgreen)

### 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.

### POC

#### Reference
- http://web.mit.edu/kerberos/advisories/MITKRB5-SA-2010-007.txt
- http://www.oracle.com/technetwork/topics/security/cpujul2015-2367936.html
- http://www.redhat.com/support/errata/RHSA-2010-0925.html

#### Github
- https://github.com/ARPSyndicate/cvemon
- https://github.com/blamhang/nopc