FreeBSD 6.1 /dev/crypto denial of service

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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5.9$0-$5k0.00

Summaryinfo

A vulnerability has been found in FreeBSD 6.1 and classified as problematic. The affected element is an unknown function of the component /dev/crypto. This manipulation causes denial of service. This vulnerability is registered as CVE-2006-5550. Furthermore, an exploit is available. The affected component should be upgraded.

Detailsinfo

A vulnerability was found in FreeBSD 6.1 (Operating System). It has been declared as problematic. Affected by this vulnerability is an unknown part of the component /dev/crypto. The manipulation with an unknown input leads to a denial of service vulnerability. The CWE definition for the vulnerability is CWE-404. The product does not release or incorrectly releases a resource before it is made available for re-use. As an impact it is known to affect availability. The summary by CVE is:

The kernel in FreeBSD 6.1 and OpenBSD 4.0 allows local users to cause a denial of service via unspecified vectors involving certain ioctl requests to /dev/crypto.

The weakness was published 10/25/2006 by Evgeny Legerov (Website). It is possible to read the advisory at elegerov.blogspot.com. This vulnerability is known as CVE-2006-5550 since 10/26/2006. The attack needs to be done within the local network. The exploitation doesn't need any form of authentication. Technical details are unknown but a public exploit is available.

A public exploit has been developed by Evgeny Legerov and been published even before and not after the advisory. It is possible to download the exploit at elegerov.blogspot.com. It is declared as proof-of-concept. The vulnerability was handled as a non-public zero-day exploit for at least 5 days. During that time the estimated underground price was around $5k-$25k.

Upgrading eliminates this vulnerability. Applying a patch is able to eliminate this problem. The bugfix is ready for download at freebsd.org. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the databases at Exploit-DB (2639), SecurityFocus (BID 20713†), OSVDB (30046†) and Secunia (SA22543†). Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

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Version

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Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.5
VulDB Meta Temp Score: 5.9

VulDB Base Score: 6.5
VulDB Temp Score: 5.9
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Denial of service
CWE: CWE-404
CAPEC: 🔍
ATT&CK: 🔍

Physical: Partially
Local: Yes
Remote: Partially

Availability: 🔍
Access: Public
Status: Proof-of-Concept
Author: Evgeny Legerov
Download: 🔍

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Exploit-DB: 🔍

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Patch: freebsd.org

Timelineinfo

10/20/2006 🔍
10/24/2006 +4 days 🔍
10/24/2006 +0 days 🔍
10/25/2006 +1 days 🔍
10/25/2006 +0 days 🔍
10/25/2006 +0 days 🔍
10/26/2006 +0 days 🔍
10/26/2006 +0 days 🔍
10/30/2006 +4 days 🔍
04/25/2026 +7117 days 🔍

Sourcesinfo

Product: freebsd.org

Advisory: elegerov.blogspot.com
Researcher: Evgeny Legerov
Status: Confirmed

CVE: CVE-2006-5550 (🔍)
GCVE (CVE): GCVE-0-2006-5550
GCVE (VulDB): GCVE-100-2635
SecurityFocus: 20713 - FreeBSD Crypto Local Denial of Service Vulnerability
Secunia: 22543 - FreeBSD "/dev/crypto" Local Denial of Service Vulnerability, Not Critical
OSVDB: 30046 - FreeBSD /dev/crypto ioctl Request Unspecified Local DoS

scip Labs: https://www.scip.ch/en/?labs.20161013

Entryinfo

Created: 10/30/2006 09:19
Updated: 04/25/2026 15:45
Changes: 10/30/2006 09:19 (65), 04/22/2018 13:15 (11), 12/07/2024 12:59 (16), 04/25/2026 15:45 (1)
Complete: 🔍
Cache ID: 216::103

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

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