Cisco IOS/IOS XE DHCP Relay memory corruption

CVSS Meta Temp Score
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CTI Interest Score
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9.7$5k-$25k0.00

Summaryinfo

A vulnerability, which was classified as very critical, was found in Cisco IOS and IOS XE. This vulnerability affects unknown code of the component DHCP Relay. Executing a manipulation can lead to input validation. This vulnerability is tracked as CVE-2017-12240. The attack can be launched remotely. Moreover, an exploit is present. You should upgrade the affected component.

Detailsinfo

A vulnerability was found in Cisco IOS and IOS XE (Router Operating System) (affected version not known). It has been declared as very critical. This vulnerability affects some unknown functionality of the component DHCP Relay. The manipulation with an unknown input leads to a input validation vulnerability. The CWE definition for the vulnerability is CWE-119. The product performs operations on a memory buffer, but it can read from or write to a memory location that is outside of the intended boundary of the buffer. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

The DHCP relay subsystem of Cisco IOS 12.2 through 15.6 and Cisco IOS XE Software contains a vulnerability that could allow an unauthenticated, remote attacker to execute arbitrary code and gain full control of an affected system. The attacker could also cause an affected system to reload, resulting in a denial of service (DoS) condition. The vulnerability is due to a buffer overflow condition in the DHCP relay subsystem of the affected software. An attacker could exploit this vulnerability by sending a crafted DHCP Version 4 (DHCPv4) packet to an affected system. A successful exploit could allow the attacker to execute arbitrary code and gain full control of the affected system or cause the affected system to reload, resulting in a DoS condition. Cisco Bug IDs: CSCsm45390, CSCuw77959.

The bug was discovered 09/27/2017. The weakness was disclosed 09/29/2017 as cisco-sa-20170927-dhcp as confirmed advisory (Website). The advisory is available at tools.cisco.com. This vulnerability was named CVE-2017-12240 since 08/03/2017. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Technical details are unknown but an exploit is available. The structure of the vulnerability defines a possible price range of USD $5k-$25k at the moment (estimation calculated on 09/09/2024).

It is declared as attacked. As 0-day the estimated underground price was around $25k-$100k. The vulnerability scanner Nessus provides a plugin with the ID 103565 (Cisco IOS Software DHCP Remote Code Execution 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 316143 (Cisco IOS and IOS XE Software DHCP Remote Code Execution Vulnerability (cisco-sa-20170927-dhcp)). This issue was added on 03/03/2022 to the CISA Known Exploited Vulnerabilities Catalog with a due date of 03/24/2022:

Apply updates per vendor instructions.

Upgrading eliminates this vulnerability. A possible mitigation has been published even before and not after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Tenable (103565) and SecurityFocus (BID 101034†). The entry VDB-107239 is pretty similar. If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

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CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 9.8
VulDB Meta Temp Score: 9.7

VulDB Base Score: 9.8
VulDB Temp Score: 9.4
VulDB Vector: 🔍
VulDB Reliability: 🔍

Vendor Base Score (Cisco): 9.8
Vendor Vector (Cisco): 🔍

NVD Base Score: 9.8
NVD Vector: 🔍

CVSSv2info

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

NVD Base Score: 🔍

Exploitinginfo

Class: Memory corruption
CWE: CWE-119
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Attacked

EPSS Score: 🔍
EPSS Percentile: 🔍

KEV Added: 🔍
KEV Due: 🔍
KEV Remediation: 🔍
KEV Ransomware: 🔍
KEV Notice: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 103565
Nessus Name: Cisco IOS Software DHCP Remote Code Execution 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: 🔍

Timelineinfo

08/03/2017 🔍
09/27/2017 +55 days 🔍
09/27/2017 +0 days 🔍
09/27/2017 +0 days 🔍
09/28/2017 +1 days 🔍
09/29/2017 +1 days 🔍
09/29/2017 +0 days 🔍
10/02/2017 +3 days 🔍
09/09/2024 +2534 days 🔍

Sourcesinfo

Vendor: cisco.com

Advisory: cisco-sa-20170927-dhcp
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2017-12240 (🔍)
GCVE (CVE): GCVE-0-2017-12240
GCVE (VulDB): GCVE-100-107242

OVAL: 🔍

SecurityFocus: 101034 - Cisco IOS and IOS XE Software CVE-2017-12240 Buffer Overflow Vulnerability
SecurityTracker: 1039445

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

Entryinfo

Created: 09/29/2017 12:02
Updated: 09/09/2024 22:29
Changes: 09/29/2017 12:02 (81), 11/20/2019 13:35 (6), 01/14/2021 18:39 (2), 04/23/2024 19:37 (27), 07/17/2024 02:26 (2), 09/09/2024 22:29 (2)
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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