OpenBSD up to 3.6 TCP Connection Timestamp denial of service

CVSS Meta Temp Score
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CTI Interest Score
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4.8$0-$5k0.00

A vulnerability was found in OpenBSD up to 3.6 (Operating System). It has been rated as critical. This issue affects some unknown functionality of the component TCP Connection Timestamp Handler. 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. The summary by CVE is:

Multiple TCP implementations with Protection Against Wrapped Sequence Numbers (PAWS) with the timestamps option enabled allow remote attackers to cause a denial of service (connection loss) via a spoofed packet with a large timer value, which causes the host to discard later packets because they appear to be too old.

The bug was discovered 05/18/2005. The weakness was presented 05/19/2005 by Noritoshi Demizu with US-CERT (Website). The advisory is shared at openbsd.org. The identification of this vulnerability is CVE-2005-0356 since 02/11/2005. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Technical details are unknown but a public exploit is available. MITRE ATT&CK project uses the attack technique T1499 for this issue.

After 2 days, there has been an exploit disclosed. The exploit is available at exploit-db.com. It is declared as proof-of-concept. The vulnerability was handled as a non-public zero-day exploit for at least 1 days. During that time the estimated underground price was around $5k-$25k. The vulnerability scanner Nessus provides a plugin with the ID 78204 (F5 Networks BIG-IP : Inadequate validation for TCP segments (SOL4743)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family F5 Networks Local Security Checks and running in the context l.

Applying a patch is able to eliminate this problem. The bugfix is ready for download at ftp.openbsd.org. A possible mitigation has been published 3 years after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at X-Force (20635), Tenable (78204) and Exploit-DB (1008). secunia.com is providing further details. See 1489, 1490, 1491 and 1535 for similar entries.

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CPE 2.3info

CPE 2.2info

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CVSSv3info

VulDB Meta Base Score: 5.3
VulDB Meta Temp Score: 4.8

VulDB Base Score: 5.3
VulDB Temp Score: 4.8
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CVSSv2info

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Exploitinginfo

Class: Denial of service
CWE: CWE-404
ATT&CK: T1499

Local: No
Remote: Yes

Availability: 🔍
Access: Public
Status: Proof-of-Concept
Download: 🔍

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Nessus ID: 78204
Nessus Name: F5 Networks BIG-IP : Inadequate validation for TCP segments (SOL4743)
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OpenVAS ID: 53976
OpenVAS Name: FreeBSD Security Advisory (FreeBSD-SA-05:15.tcp.asc)
OpenVAS File: 🔍
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Exploit-DB: 🔍

Threat Intelligenceinfo

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Countermeasuresinfo

Recommended: Patch
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Patch: ftp.openbsd.org

Timelineinfo

02/11/2005 🔍
05/18/2005 +96 days 🔍
05/18/2005 +0 days 🔍
05/18/2005 +0 days 🔍
05/19/2005 +1 days 🔍
05/19/2005 +0 days 🔍
05/21/2005 +1 days 🔍
05/30/2005 +9 days 🔍
05/31/2005 +1 days 🔍
05/16/2007 +715 days 🔍
10/10/2014 +2704 days 🔍
07/03/2019 +1727 days 🔍

Sourcesinfo

Advisory: openbsd.org
Researcher: Noritoshi Demizu
Organization: US-CERT
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2005-0356 (🔍)
X-Force: 20635 - TCP/IP timestamp denial of service, Medium Risk
SecurityTracker: 1014001
SecurityFocus: 13676 - Multiple Vendor TCP Timestamp PAWS Remote Denial Of Service Vulnerability
Secunia: 15417 - OpenBSD TCP Timestamp Denial of Service, Less Critical
OSVDB: 16685 - Multiple Vendor Malformed TCP Timestamp DoS

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

Created: 05/30/2005 14:51
Updated: 07/03/2019 09:15
Changes: 05/30/2005 14:51 (93), 07/03/2019 09:15 (8)
Complete: 🔍

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