ISC DHCP up to 4.2.1 input validation

CVSS Meta Temp Score
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CTI Interest Score
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6.9$0-$5k0.00

Summaryinfo

A vulnerability, which was classified as critical, has been found in ISC DHCP up to 4.2.1. Affected is an unknown function. The manipulation leads to input validation. This vulnerability is listed as CVE-2011-0997. In addition, an exploit is available.

Detailsinfo

A vulnerability was found in ISC DHCP up to 4.2.1 (Network Management Software). It has been rated as critical. This issue affects an unknown functionality. 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 confidentiality, integrity, and availability. The summary by CVE is:

dhclient in ISC DHCP 3.0.x through 4.2.x before 4.2.1-P1, 3.1-ESV before 3.1-ESV-R1, and 4.1-ESV before 4.1-ESV-R2 allows remote attackers to execute arbitrary commands via shell metacharacters in a hostname obtained from a DHCP message, as demonstrated by a hostname that is provided to dhclient-script.

The weakness was presented 04/05/2011 by Sebastian Krahmer with SuSE Security Team as confirmed advisory (CERT.org). It is possible to read the advisory at kb.cert.org. The identification of this vulnerability is CVE-2011-0997. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Technical details are unknown but a public exploit is available.

A public exploit has been developed by Pierre Kim and been published 5 years after the advisory. The exploit is available 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 68251 (Oracle Linux 4 / 5 / 6 : dhcp (ELSA-2011-0428)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Oracle Linux Local Security Checks. The commercial vulnerability scanner Qualys is able to test this issue with plugin 119468 (VMware ESX Console OS Multiple Vulnerabilities (VMSA-2011-0010)).

A possible mitigation has been published immediately after the disclosure of the vulnerability. Furthermore it is possible to detect and prevent this kind of attack with TippingPoint and the filter 11457.

The vulnerability is also documented in the databases at X-Force (66580), Exploit-DB (37623), Tenable (68251), SecurityFocus (BID 47176†) and OSVDB (71493†). Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.3
VulDB Meta Temp Score: 6.9

VulDB Base Score: 7.3
VulDB Temp Score: 6.9
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

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VulDB Base Score: 🔍
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Exploitinginfo

Class: Input validation
CWE: CWE-20
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Access: Public
Status: Proof-of-Concept
Author: Pierre Kim
Download: 🔍

EPSS Score: 🔍
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Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 68251
Nessus Name: Oracle Linux 4 / 5 / 6 : dhcp (ELSA-2011-0428)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Port: 🔍

OpenVAS ID: 69560
OpenVAS Name: Debian Security Advisory DSA 2216-1 (isc-dhcp)
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Exploit-DB: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

Reaction Time: 🔍
0-Day Time: 🔍
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TippingPoint: 🔍

McAfee IPS: 🔍
McAfee IPS Version: 🔍

ISS Proventia IPS: 🔍
Fortigate IPS: 🔍

Timelineinfo

02/14/2011 🔍
04/05/2011 +50 days 🔍
04/05/2011 +0 days 🔍
04/05/2011 +0 days 🔍
04/06/2011 +1 days 🔍
04/08/2011 +1 days 🔍
04/08/2011 +0 days 🔍
04/10/2011 +2 days 🔍
07/12/2013 +824 days 🔍
03/20/2015 +616 days 🔍
07/16/2015 +118 days 🔍
07/16/2015 +0 days 🔍
12/08/2024 +3433 days 🔍

Sourcesinfo

Vendor: isc.org

Advisory: RHSA-2011:0428
Researcher: Sebastian Krahmer
Organization: SuSE Security Team
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2011-0997 (🔍)
GCVE (CVE): GCVE-0-2011-0997
GCVE (VulDB): GCVE-100-57023

OVAL: 🔍
IAVM: 🔍

CERT: 🔍
X-Force: 66580
SecurityFocus: 47176 - ISC DHCP 'dhclient' Shell Characters in Response Remote Code Execution Vulnerability
Secunia: 44037
OSVDB: 71493 - ISC DHCP dhclient Response Handling Metacharacter Shell Command Execution
SecurityTracker: 1025300
Vulnerability Center: 30951 - ISC DHCP dhclient Remote Commands Execution via Shell Metacharacters in a Hostname, High

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

Entryinfo

Created: 03/20/2015 16:16
Updated: 12/08/2024 20:03
Changes: 03/20/2015 16:16 (75), 03/20/2017 09:36 (17), 10/21/2021 20:16 (6), 10/21/2021 20:23 (1), 10/21/2021 20:30 (2), 12/08/2024 20:03 (16)
Complete: 🔍
Cache ID: 216::103

Be aware that VulDB is the high quality source for vulnerability data.

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