Cisco IOS up to 12.4 Regular Expression input validation

CVSS Meta Temp Score
CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.
Current Exploit Price (≈)
Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.
CTI Interest Score
Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
4.8$0-$5k0.00

Summaryinfo

A vulnerability has been found in Cisco IOS up to 12.4 and classified as problematic. The impacted element is an unknown function of the component Regular Expression Handler. This manipulation causes input validation. This vulnerability is tracked as CVE-2007-4430. Moreover, an exploit is present. The affected component should be disabled.

Detailsinfo

A vulnerability has been found in Cisco IOS up to 12.4 (Router Operating System) and classified as problematic. Affected by this vulnerability is an unknown part of the component Regular Expression Handler. The manipulation with an unknown input leads to a input validation vulnerability. The CWE definition for the vulnerability is 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. As an impact it is known to affect availability. The summary by CVE is:

Unspecified vulnerability in Cisco IOS 12.0 through 12.4 allows context-dependent attackers to cause a denial of service (device restart and BGP routing table rebuild) via certain regular expressions in a "show ip bgp regexp" command. NOTE: unauthenticated remote attacks are possible in environments with anonymous telnet and Looking Glass access.

The bug was discovered 08/17/2007. The weakness was disclosed 09/13/2007 by Sebastian Wiesinger with Heise Security (Website). It is possible to read the advisory at cisco.com. This vulnerability is known as CVE-2007-4430 since 08/20/2007. The attack needs to be done within the local network. The exploitation doesn't need any form of authentication. Technical details are unknown but a public exploit is available.

It is possible to download the exploit at exploit-db.com. It is declared as proof-of-concept. We expect the 0-day to have been worth approximately $5k-$25k. The vulnerability scanner Nessus provides a plugin with the ID 17790 (Cisco Regular Expression Processing DoS), 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 c.

Applying a patch is able to eliminate this problem. The bugfix is ready for download at cisco.com. 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 (36399), Exploit-DB (30506), Tenable (17790), SecurityFocus (BID 25352†) and OSVDB (37104†). 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: 5.3
VulDB Meta Temp Score: 4.8

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

CVSSv2info

AVACAuCIA
💳💳💳💳💳💳
💳💳💳💳💳💳
💳💳💳💳💳💳
VectorComplexityAuthenticationConfidentialityIntegrityAvailability
UnlockUnlockUnlockUnlockUnlockUnlock
UnlockUnlockUnlockUnlockUnlockUnlock
UnlockUnlockUnlockUnlockUnlockUnlock

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

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-DayUnlockUnlockUnlockUnlock
TodayUnlockUnlockUnlockUnlock

Nessus ID: 17790
Nessus Name: Cisco Regular Expression Processing DoS
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

Exploit-DB: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Disable
Status: 🔍

0-Day Time: 🔍

Patch: cisco.com

Timelineinfo

12/19/2002 🔍
08/17/2007 +1702 days 🔍
08/17/2007 +0 days 🔍
08/17/2007 +0 days 🔍
08/20/2007 +3 days 🔍
08/20/2007 +0 days 🔍
09/12/2007 +23 days 🔍
09/13/2007 +1 days 🔍
09/13/2007 +0 days 🔍
09/13/2007 +0 days 🔍
09/16/2007 +2 days 🔍
09/19/2007 +3 days 🔍
01/10/2012 +1574 days 🔍
11/24/2024 +4702 days 🔍

Sourcesinfo

Vendor: cisco.com

Advisory: cisco.com
Researcher: Sebastian Wiesinger
Organization: Heise Security
Status: Confirmed

CVE: CVE-2007-4430 (🔍)
GCVE (CVE): GCVE-0-2007-4430
GCVE (VulDB): GCVE-100-3307
X-Force: 36399
SecurityFocus: 25352 - Cisco IOS Show IP BGP Regexp Remote Denial of Service Vulnerability
Secunia: 26798
OSVDB: 37104 - Cisco IOS Regular Expressions (Regexp) Processing DoS
SecurityTracker: 1018685
Vulnerability Center: 16046 - [cisco-sr-20070912-regexp] Cisco IOS Remote DoS via Regular Expressions in \, Medium
Vupen: ADV-2007-3136

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

Entryinfo

Created: 09/19/2007 09:00
Updated: 11/24/2024 14:56
Changes: 09/19/2007 09:00 (87), 07/25/2019 17:15 (1), 11/24/2024 14:56 (24)
Complete: 🔍
Cache ID: 216::103

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Discussion

No comments yet. Languages: en.

Please log in to comment.

◂ PreviousOverviewNext ▸

Want to know what is going to be exploited?

We predict KEV entries!