FreeBSD 7.4/8.0/8.1/8.2 Access Restriction mountd.c makemask input validation

CVSS Meta Temp Score
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CTI Interest Score
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5.0$5k-$25k0.00

Summaryinfo

A vulnerability has been found in FreeBSD 7.4/8.0/8.1/8.2 and classified as critical. The affected element is the function makemask of the file mountd.c of the component Access Restriction. The manipulation leads to input validation. This vulnerability is referenced as CVE-2011-1739. No exploit is available.

Detailsinfo

A vulnerability, which was classified as critical, has been found in FreeBSD 7.4/8.0/8.1/8.2 (Operating System). This issue affects the function makemask of the file mountd.c of the component Access Restriction. 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 integrity. The summary by CVE is:

The makemask function in mountd.c in mountd in FreeBSD 7.4 through 8.2 does not properly handle a -network field specifying a CIDR block with a prefix length that is not an integer multiple of 8, which allows remote attackers to bypass intended access restrictions in opportunistic circumstances via an NFS mount request.

The weakness was published 05/03/2011 (Website). The advisory is shared at security.FreeBSD.org. The identification of this vulnerability is CVE-2011-1739 since 04/19/2011. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Technical details are known, but no exploit is available. The price for an exploit might be around USD $5k-$25k at the moment (estimation calculated on 11/05/2021).

It is declared as proof-of-concept. The vulnerability scanner Nessus provides a plugin with the ID 65969 (FreeBSD : FreeBSD -- Network ACL mishandling in mountd(8) (87261557-a450-11e2-9898-001060e06fd4)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family FreeBSD Local Security Checks.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the databases at X-Force (66981), Tenable (65969), SecurityFocus (BID 47517†), Secunia (SA44307†) and SecurityTracker (ID 1025425†). Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

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Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.3
VulDB Meta Temp Score: 5.0

VulDB Base Score: 5.3
VulDB Temp Score: 5.0
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
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NVD Base Score: 🔍

Exploitinginfo

Class: Input validation
CWE: CWE-20
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: 65969
Nessus Name: FreeBSD : FreeBSD -- Network ACL mishandling in mountd(8) (87261557-a450-11e2-9898-001060e06fd4)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Port: 🔍

OpenVAS ID: 68501
OpenVAS Name: FreeBSD Ports: FreeBSD
OpenVAS File: 🔍
OpenVAS Family: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔍

Timelineinfo

04/19/2011 🔍
04/20/2011 +1 days 🔍
04/20/2011 +0 days 🔍
04/21/2011 +1 days 🔍
04/21/2011 +0 days 🔍
05/03/2011 +12 days 🔍
05/03/2011 +0 days 🔍
04/14/2013 +712 days 🔍
04/17/2013 +3 days 🔍
03/23/2015 +705 days 🔍
11/05/2021 +2419 days 🔍

Sourcesinfo

Product: freebsd.org

Advisory: security.FreeBSD.org
Status: Confirmed

CVE: CVE-2011-1739 (🔍)
GCVE (CVE): GCVE-0-2011-1739
GCVE (VulDB): GCVE-100-57305
X-Force: 66981
SecurityFocus: 47517 - FreeBSD 'mountd' Incorrect Netmask Access Control List (ACL) Security Bypass Vulnerability
Secunia: 44307 - FreeBSD update for mountd, Not Critical
SecurityTracker: 1025425 - FreeBSD mountd Lets Remote Users Bypass Access Controls in Certain Cases
Vulnerability Center: 39220 - FreeBSD Until and Including 8.2 Remote Security Bypass via an NFS Mount Request, Medium
Vupen: ADV-2011-1076

Entryinfo

Created: 03/23/2015 16:50
Updated: 11/05/2021 14:58
Changes: 03/23/2015 16:50 (62), 04/27/2017 09:16 (17), 11/05/2021 14:58 (3)
Complete: 🔍
Cache ID: 216::103

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

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