Cisco IOS 12.0/12.1/12.2 GRE Source Routing Filter privileges management

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

Summaryinfo

A vulnerability was found in Cisco IOS 12.0/12.1/12.2. It has been rated as critical. Impacted is an unknown function of the component GRE Source Routing Filter. The manipulation leads to privileges management. This vulnerability is listed as CVE-2006-4650. The attack may be initiated remotely. In addition, an exploit is available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability, which was classified as critical, has been found in Cisco IOS 12.0/12.1/12.2 (Router Operating System). This issue affects an unknown function of the component GRE Source Routing Filter. The manipulation with an unknown input leads to a privileges management vulnerability. Using CWE to declare the problem leads to CWE-269. The product does not properly assign, modify, track, or check privileges for an actor, creating an unintended sphere of control for that actor. Impacted is integrity. The summary by CVE is:

Cisco IOS 12.0, 12.1, and 12.2, when GRE IP tunneling is used and the RFC2784 compliance fixes are missing, does not verify the offset field of a GRE packet during decapsulation, which leads to an integer overflow that references data from incorrect memory locations, which allows remote attackers to inject crafted packets into the routing queue, possibly bypassing intended router ACLs.

The weakness was presented 09/07/2006 by Felix Lindner (FX) with Phenoelit (Website). The advisory is shared at phenoelit.de. The identification of this vulnerability is CVE-2006-4650 since 09/08/2006. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Technical details are unknown but an exploit is available. MITRE ATT&CK project uses the attack technique T1068 for this issue.

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 426 days. During that time the estimated underground price was around $25k-$100k. The vulnerability scanner Nessus provides a plugin with the ID 17789 (Cisco IOS GRE Decapsulation Vulnerability), which helps to determine the existence of the flaw in a target environment. It is assigned to the family CISCO and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 43140 (Cisco IOS GRE Decapsulation Vulnerability).

Upgrading eliminates this vulnerability. Applying a patch is able to eliminate this problem. The bugfix is ready for download at cisco.com. The best possible mitigation is suggested to be upgrading to the latest version. A possible mitigation has been published before and not just after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at X-Force (28786), Tenable (17789), SecurityFocus (BID 19878†), OSVDB (28590†) and Secunia (SA21783†). Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

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

VulDB Base Score: 5.3
VulDB Temp Score: 4.8
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

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

NVD Base Score: 🔍

Exploitinginfo

Class: Privileges management
CWE: CWE-269 / CWE-266
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: 17789
Nessus Name: Cisco IOS GRE Decapsulation Vulnerability
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Patch: cisco.com

Timelineinfo

07/07/2005 🔍
09/06/2006 +426 days 🔍
09/06/2006 +0 days 🔍
09/06/2006 +0 days 🔍
09/06/2006 +0 days 🔍
09/07/2006 +1 days 🔍
09/07/2006 +0 days 🔍
09/08/2006 +0 days 🔍
09/08/2006 +0 days 🔍
09/08/2006 +0 days 🔍
09/19/2006 +11 days 🔍
01/10/2012 +1939 days 🔍
03/13/2021 +3350 days 🔍

Sourcesinfo

Vendor: cisco.com

Advisory: phenoelit.de
Researcher: Felix Lindner (FX)
Organization: Phenoelit
Status: Confirmed

CVE: CVE-2006-4650 (🔍)
GCVE (CVE): GCVE-0-2006-4650
GCVE (VulDB): GCVE-100-2513

OVAL: 🔍

X-Force: 28786 - Cisco IOS GRE decapsulation ACL bypass, Medium Risk
SecurityFocus: 19878 - Cisco IOS Multiple GRE Source Routing Vulnerabilities
Secunia: 21783 - Cisco IOS GRE Decapsulation Vulnerability, Less Critical
OSVDB: 28590 - Cisco IOS GRE Packet Decapsulation
SecurityTracker: 1016799 - Cisco IOS GRE Parsing Error May Let Remote Users Inject Packets
Vulnerability Center: 12758 - [cisco-sr-20060906-gre] Cisco IOS Router ACLs Bypassing via GRE Packets, Low
Vupen: ADV-2006-3502

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

Entryinfo

Created: 09/08/2006 10:53
Updated: 03/13/2021 12:56
Changes: 09/08/2006 10:53 (89), 06/07/2017 16:04 (11), 03/13/2021 12:56 (2)
Complete: 🔍
Cache ID: 216:761:103

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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