CVE-2011-4862

Buffer overflow in libtelnet/encrypt.c in telnetd in FreeBSD 7.3 through 9.0, MIT Kerberos Version 5 Applications (aka krb5-appl) 1.0.2 and earlier, Heimdal…

published December 25, 2011

Patch now

High probability of exploitation

NVD has not assigned a CVSS score to this record. It sits in the 99.9th percentile for exploit probability.

CVSS
—
EPSS
95%
Percentile
99.9
In the wild
Unconfirmed
What it is

🚨 A surprisingly sneaky buffer overflow allows attackers to execute arbitrary code with just a long encryption key! Think of this vulnerability like a restaurant that serves a massive plate of spaghetti without checking if the bowl can hold it. If the plate gets too full, it spills over everywhere, causing chaos in the kitchen. That's what happens when an overly long key is used here! An attacker could exploit this to run malicious code on the system, leading to potentially devastating results like unauthorized access and data loss. This isn’t just a minor inconvenience; it could compromise the entire server and the data it holds!

Put simply

Think of this vulnerability like a restaurant that serves a massive plate of spaghetti without checking if the bowl can hold it. If the plate gets too full, it spills over everywhere, causing chaos in the kitchen. That's what happens when an overly long key is used here! The buffer overflow in libtelnet/encrypt.c allows for the execution of arbitrary code when a long encryption key is sent. This is particularly dangerous in telnetd used by various operating systems including FreeBSD and MIT Kerberos applications.

What to do

An attacker could exploit this to run malicious code on the system, leading to potentially devastating results like unauthorized access and data loss. This isn’t just a minor inconvenience; it could compromise the entire server and the data it holds! To protect against this, update vulnerable systems to the latest versions of FreeBSD and Kerberos. Review your configurations to ensure encryption keys are properly managed and limit their length to prevent overflow issues. You've got this! Just follow these steps, and you'll have everything secured in no time. 🛡️

The record
Technical detail
CVSS
Not scored
CVSS v4.0
Not supplied
EPSS
0.95061 · 99.9th percentile
Published
2011-12-25T01:00Z
EPSS history
Timeline
  • 25 DEC 01:00Z
    Buffer overflow in libtelnet/encrypt.c in telnetd in FreeBSD 7.3 through 9.0, MIT Kerberos Version 5 Applications (aka krb5-appl) 1.0.2 and earlier, Heimdal…
    cvelistv5