FreeBSD 4.5 accept_filter Mechanism 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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5.0$0-$5k0.00

A vulnerability was found in FreeBSD 4.5 (Operating System) and classified as problematic. Affected by this issue is an unknown code of the component accept_filter Mechanism. The manipulation with an unknown input leads to a denial of service vulnerability. Using CWE to declare the problem leads to CWE-404. The product does not release or incorrectly releases a resource before it is made available for re-use. Impacted is availability. CVE summarizes:

The accept_filter mechanism in FreeBSD 4 through 4.5 does not properly remove entries from the incomplete listen queue when adding a syncache, which allows remote attackers to cause a denial of service (network service availability) via a large number of connection attempts, which fills the queue.

The bug was discovered 05/29/2002. The weakness was published 04/09/2004 by Mike Silbersack (Website). The advisory is shared for download at ftp.freebsd.org. This vulnerability is handled as CVE-2002-0794. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. Technical details are unknown but an exploit is available.

After even before and not, there has been an exploit disclosed. It is declared as proof-of-concept. The vulnerability was handled as a non-public zero-day exploit for at least 75 days. During that time the estimated underground price was around $5k-$25k.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the vulnerability database at X-Force (9209). Similar entry is available at 18681.

Productinfo

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Name

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License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB CVSS-B Score: 🔍
VulDB CVSS-BT Score: 🔍
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VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.3
VulDB Meta Temp Score: 5.0

VulDB Base Score: 5.3
VulDB Temp Score: 5.0
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: 🔍

Local: No
Remote: Yes

Availability: 🔍
Status: Proof-of-Concept

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔍

Timelineinfo

05/29/2002 🔍
05/29/2002 +0 days 🔍
05/29/2002 +0 days 🔍
05/29/2002 +0 days 🔍
08/12/2002 +75 days 🔍
04/09/2004 +605 days 🔍
04/09/2004 +0 days 🔍
07/05/2009 +1913 days 🔍
07/22/2014 +1843 days 🔍
07/22/2014 +0 days 🔍

Sourcesinfo

Product: freebsd.org

Advisory: ftp.freebsd.org
Researcher: Mike Silbersack
Status: Not defined

CVE: CVE-2002-0794 (🔍)
X-Force: 9209
Vulnerability Center: 22757 - FreeBSD 4.0-4.5 Accept Filter Mechanism Remote DoS Vulnerability, Low
SecurityFocus: 4879 - FreeBSD Accept Filter Denial of Service Vulnerability
OSVDB: 5081 - FreeBSD accept_filter Listen Queue DoS

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

Entryinfo

Created: 07/22/2014 23:48
Changes: 07/22/2014 23:48 (65)
Complete: 🔍

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