Cisco IOS XE VTY Authentication Source IP Address improper authentication

CVSS Meta Temp Score
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CTI Interest Score
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4.9$0-$5k0.00

Summaryinfo

A vulnerability labeled as problematic has been found in Cisco IOS XE. This affects an unknown function of the component VTY Authentication Handler. Executing a manipulation with the input 192.168.x.2 as part of Source IP Address can lead to improper authentication. This vulnerability is tracked as CVE-2013-6979. Moreover, an exploit is present. A patch should be applied to remediate this issue.

Detailsinfo

A vulnerability classified as problematic was found in Cisco IOS XE (Router Operating System) (the affected version unknown). This vulnerability affects an unknown part of the component VTY Authentication Handler. The manipulation with the input value 192.168.x.2 leads to a improper authentication vulnerability. The CWE definition for the vulnerability is CWE-287. When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct. As an impact it is known to affect confidentiality, and integrity. CVE summarizes:

The VTY authentication implementation in Cisco IOS XE 03.02.xxSE and 03.03.xxSE incorrectly relies on the Linux-IOS internal-network configuration, which allows remote attackers to bypass authentication by leveraging access to a 192.168.x.2 source IP address, aka Bug ID CSCuj90227.

The weakness was disclosed 12/23/2013 with Cisco as CSCuj90227 as confirmed advisory (Website). The advisory is available at tools.cisco.com. This vulnerability was named CVE-2013-6979 since 12/05/2013. The attack needs to be done within the local network. No form of authentication is required for a successful exploitation. Technical details and also a public exploit are known. The advisory points out:

An unauthenticated, remote attacker could exploit this vulnerability only if their source address is in the 192.168.x.2 subnet and the attacker has IP communication to the Cisco IOS XE device. An exploit could allow the attacker to access the device with the privilege level of the vty line interface.

After immediately, there has been an exploit disclosed. It is possible to download the exploit at tools.cisco.com. It is declared as proof-of-concept. As 0-day the estimated underground price was around $5k-$25k.

Applying the patch CSCuj90227 is able to eliminate this problem. A possible mitigation has been published immediately after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at X-Force (89901), SecurityFocus (BID 64502†), OSVDB (101351†) and Vulnerability Center (SBV-42714†). If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.4
VulDB Meta Temp Score: 4.9

VulDB Base Score: 5.4
VulDB Temp Score: 4.9
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: Improper authentication
CWE: CWE-287
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

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

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Patch
Status: 🔍

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

Patch: CSCuj90227

Timelineinfo

12/05/2013 🔍
12/23/2013 +18 days 🔍
12/23/2013 +0 days 🔍
12/23/2013 +0 days 🔍
12/23/2013 +0 days 🔍
12/23/2013 +0 days 🔍
12/23/2013 +0 days 🔍
12/24/2013 +1 days 🔍
12/25/2013 +1 days 🔍
06/04/2021 +2718 days 🔍

Sourcesinfo

Vendor: cisco.com

Advisory: CSCuj90227
Organization: Cisco
Status: Confirmed

CVE: CVE-2013-6979 (🔍)
GCVE (CVE): GCVE-0-2013-6979
GCVE (VulDB): GCVE-100-11602
X-Force: 89901 - Cisco IOS XE VTY Authentication security bypass
SecurityFocus: 64502
OSVDB: 101351
SecurityTracker: 1029537
Vulnerability Center: 42714 - Cisco IOS XE Remote Security Bypass Vulnerability due to Incomplete Validation of Linux-IOS Internal Network interface, Medium

scip Labs: https://www.scip.ch/en/?labs.20150108

Entryinfo

Created: 12/24/2013 23:42
Updated: 06/04/2021 14:40
Changes: 12/24/2013 23:42 (52), 05/18/2017 17:23 (22), 06/04/2021 14:40 (3)
Complete: 🔍
Cache ID: 216::103

If you want to get best quality of vulnerability data, you may have to visit VulDB.

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