Red Hat update for krb5

Published: 2011-12-27 | Updated: 2017-05-03
Risk Critical
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2011-4862
Exploitation vector Network
Public exploit This vulnerability is being exploited in the wild.
Vulnerable software
Red Hat Enterprise Linux Desktop
Operating systems & Components / Operating system

Red Hat Enterprise Linux Server
Operating systems & Components / Operating system

Vendor Red Hat Inc.

Security Bulletin

This security bulletin contains one critical risk vulnerability.

1) Buffer overflow


Risk: Critical


CVE-ID: CVE-2011-4862

CWE-ID: CWE-119 - Improper Restriction of Operations within the Bounds of a Memory Buffer

Exploit availability: Yes


The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The weakness exists due to buffer overflow in the encrypt_keyid() function of telnetd. A remote attacker can send a very large encryption key to telnetd daemon, trigger buffer overflow and execute arbitrary code with root privileges.

Successful exploitation of the vulnerability results in arbitrary code execution on the vulnerable system.

Note: the vulnerability was being actively exploited.


Install updates from vendor's website.

Vulnerable software versions

Red Hat Enterprise Linux Desktop: 5

Red Hat Enterprise Linux Server: v.5

CPE2.3 External links

Q & A

Can this vulnerability be exploited remotely?

Is there known malware, which exploits this vulnerability?