Cisco IOS IPSec Tunnel Implementation input validation

CVSS Meta Temp Score
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CTI Interest Score
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5.1$0-$5k0.00

Summaryinfo

A vulnerability marked as problematic has been reported in Cisco IOS. Affected by this issue is some unknown functionality of the component IPSec Tunnel Implementation. The manipulation leads to input validation. This vulnerability is traded as CVE-2013-6694. There is no exploit available. The suggested workaround should be applied.

Detailsinfo

A vulnerability was found in Cisco IOS (Router Operating System) (the affected version is unknown) and classified as problematic. This issue affects an unknown code of the component IPSec Tunnel Implementation. The manipulation with an unknown input leads to a input validation vulnerability. Using CWE to declare the problem leads to 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. Impacted is availability. The summary by CVE is:

The IPSec implementation in Cisco IOS allows remote attackers to cause a denial of service (MTU change and tunnel-session drop) via crafted ICMP packets, aka Bug ID CSCul29918.

The weakness was shared 11/22/2013 with Cisco as 31874 as confirmed alert (Website). The advisory is shared at tools.cisco.com. The identification of this vulnerability is CVE-2013-6694 since 11/07/2013. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Neither technical details nor an exploit are publicly available. The advisory points out:

An attacker could exploit this vulnerability by sending specific ICMP packets to an affected device in order to change the configured MTU value of the tunnel interface. An exploit could allow the attacker to change the tunnel MTU or path MTU and potentially cause IPSec tunnels to drop.

The commercial vulnerability scanner Qualys is able to test this issue with plugin 43350 (Cisco IOS Software IPSec MTU Vulnerability (CSCul29918) - Zero Day).

The best possible mitigation is suggested to be Workaround. Only trusted users should be allowed to access an IPSec VPN. An IP-based Access Control List could be used to prevent non-trusted users from accessing.

The vulnerability is also documented in the databases at X-Force (89189), SecurityFocus (BID 63874†), OSVDB (100277†), Secunia (SA55871†) and Vulnerability Center (SBV-42425†). If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

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License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.3
VulDB Meta Temp Score: 5.1

VulDB Base Score: 5.3
VulDB Temp Score: 5.1
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: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Workaround
Status: 🔍

0-Day Time: 🔍

Timelineinfo

11/07/2013 🔍
11/22/2013 +15 days 🔍
11/22/2013 +0 days 🔍
11/22/2013 +0 days 🔍
11/22/2013 +0 days 🔍
11/25/2013 +3 days 🔍
11/28/2013 +3 days 🔍
12/02/2013 +4 days 🔍
12/23/2024 +4039 days 🔍

Sourcesinfo

Vendor: cisco.com

Advisory: 31874
Organization: Cisco
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2013-6694 (🔍)
GCVE (CVE): GCVE-0-2013-6694
GCVE (VulDB): GCVE-100-11309
X-Force: 89189
SecurityFocus: 63874 - Cisco IOS IPSec MTU Remote Denial of Service Vulnerability
Secunia: 55871 - Cisco IOS ICMP Processing IPSec Tunnels Denial of Service Vulnerability, Not Critical
OSVDB: 100277
Vulnerability Center: 42425 - Cisco IOS Remote DoS in IPSec Tunnel via Crafted ICMP Packets, Medium

Entryinfo

Created: 11/28/2013 11:35
Updated: 12/23/2024 05:57
Changes: 11/28/2013 11:35 (68), 05/16/2017 04:28 (4), 12/23/2024 05:57 (18)
Complete: 🔍
Committer: olku
Cache ID: 216:C1E:103

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