Cisco VPN Concentrator up to 2.5.2 Login input validation

CVSS Meta Temp Score
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CTI Interest Score
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6.7$0-$5k0.00

Summaryinfo

A vulnerability has been found in Cisco VPN Concentrator up to 2.5.2 and classified as problematic. The affected element is an unknown function of the component Login Handler. Performing a manipulation results in input validation. This vulnerability was named CVE-2001-0427. The attack may be initiated remotely. In addition, an exploit is available. The affected component should be upgraded.

Detailsinfo

A vulnerability classified as critical has been found in Cisco VPN Concentrator up to 2.5.2 (Network Encryption Software). This affects an unknown part of the component Login Handler. The manipulation with an unknown input leads to a input validation vulnerability. CWE is classifying the issue as CWE-20. The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. This is going to have an impact on availability. The summary by CVE is:

Cisco VPN 3000 series concentrators before 2.5.2(F) allow remote attackers to cause a denial of service via a flood of invalid login requests to (1) the SSL service, or (2) the telnet service, which do not properly disconnect the user after several failed login attempts.

The weakness was presented 03/29/2001 as confirmed advisory (Website). It is possible to read the advisory at cisco.com. This vulnerability is uniquely identified as CVE-2001-0427. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. Technical details are unknown but an exploit is available.

After before and not just, 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 1 days. During that time the estimated underground price was around $0-$5k. The vulnerability scanner Nessus provides a plugin with the ID 11290 (Cisco VPN Concentrator Invalid Login DoS (CSCdu82823)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family CISCO, running in the context r and relying on port 161.

Upgrading eliminates this vulnerability. A possible mitigation has been published 50 minutes after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at X-Force (6298), Tenable (11290), SecurityFocus (BID 88960†), OSVDB (5643†) and Vulnerability Center (SBV-2804†). Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Type

Vendor

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.5
VulDB Meta Temp Score: 6.7

VulDB Base Score: 7.5
VulDB Temp Score: 6.7
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Input validation
CWE: CWE-20
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Proof-of-Concept

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 11290
Nessus Name: Cisco VPN Concentrator Invalid Login DoS (CSCdu82823)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍
Nessus Port: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

Reaction Time: 🔍
0-Day Time: 🔍
Exposure Time: 🔍

Timelineinfo

03/28/2001 🔍
03/29/2001 +0 days 🔍
03/29/2001 +0 days 🔍
06/18/2001 +81 days 🔍
01/01/2003 +562 days 🔍
03/01/2003 +59 days 🔍
10/19/2003 +232 days 🔍
04/09/2004 +172 days 🔍
07/04/2014 +3738 days 🔍
05/16/2019 +1777 days 🔍

Sourcesinfo

Vendor: cisco.com

Advisory: cisco.com
Status: Confirmed

CVE: CVE-2001-0427 (🔍)
GCVE (CVE): GCVE-0-2001-0427
GCVE (VulDB): GCVE-100-16803
X-Force: 6298 - Cisco VPN 3000 Concentrators Telnet denial of service
SecurityFocus: 88960
OSVDB: 5643 - Cisco VPN Concentrator Invalid Login DoS
Vulnerability Center: 2804 - [cisco-sa-20010328-vpn3k-telnet] Bug in telnetd implementation in the remote VPN concentrator., High

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

Entryinfo

Created: 07/04/2014 14:16
Updated: 05/16/2019 16:37
Changes: 07/04/2014 14:16 (63), 05/16/2019 16:37 (10)
Complete: 🔍
Cache ID: 216::103

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