FreeBSD 11.2/11.3/12.0 File Descriptors Underflow access control

CVSS Meta Temp Score
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CTI Interest Score
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6.3$0-$5k0.00

Summaryinfo

A vulnerability categorized as critical has been discovered in FreeBSD 11.2/11.3/12.0. Affected by this issue is some unknown functionality of the component File Descriptors. Executing a manipulation can lead to access control (Underflow). This vulnerability is tracked as CVE-2019-5603. The attack is restricted to local execution. Moreover, an exploit is present. Applying a patch is advised to resolve this issue.

Detailsinfo

A vulnerability was found in FreeBSD 11.2/11.3/12.0 (Operating System). It has been declared as critical. This vulnerability affects an unknown functionality of the component File Descriptors. The manipulation with an unknown input leads to a access control vulnerability (Underflow). The CWE definition for the vulnerability is CWE-264. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

In FreeBSD 12.0-STABLE before r350261, 12.0-RELEASE before 12.0-RELEASE-p8, 11.3-STABLE before r350263, 11.3-RELEASE before 11.3-RELEASE-p1, and 11.2-RELEASE before 11.2-RELEASE-p12, system calls operating on file descriptors as part of mqueuefs did not properly release the reference allowing a malicious user to overflow the counter allowing access to files, directories, and sockets opened by processes owned by other users.

The weakness was disclosed 07/26/2019 (Website). The advisory is shared for download at security.FreeBSD.org. This vulnerability was named CVE-2019-5603 since 01/07/2019. The attack needs to be approached locally. No form of authentication is required for a successful exploitation. Technical details are unknown but a public exploit is available. The MITRE ATT&CK project declares the attack technique as T1068.

A public exploit has been developed by Karsten König (gr4yf0x) in Bash and been published 6 months after the advisory. It is possible to download the exploit at exploit-db.com. It is declared as proof-of-concept.

Applying a patch is able to eliminate this problem.

The vulnerability is also documented in the vulnerability database at Exploit-DB (47830). The entries VDB-138836, VDB-138835, VDB-138834 and VDB-138833 are pretty similar. VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

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Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.5
VulDB Meta Temp Score: 6.3

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

NVD Base Score: 7.8
NVD Vector: 🔍

CVSSv2info

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

NVD Base Score: 🔍

Exploitinginfo

Name: Underflow
Class: Access control / Underflow
CWE: CWE-264
CAPEC: 🔍
ATT&CK: 🔍

Physical: Partially
Local: Yes
Remote: No

Availability: 🔍
Access: Public
Status: Proof-of-Concept
Author: Karsten König (gr4yf0x)
Programming Language: 🔍
Download: 🔍

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Exploit-DB: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Patch
Status: 🔍

0-Day Time: 🔍
Exploit Delay Time: 🔍

Timelineinfo

01/07/2019 🔍
07/26/2019 +200 days 🔍
07/26/2019 +0 days 🔍
12/30/2019 +157 days 🔍
11/13/2023 +1414 days 🔍

Sourcesinfo

Product: freebsd.org

Advisory: 153752
Status: Not defined

CVE: CVE-2019-5603 (🔍)
GCVE (CVE): GCVE-0-2019-5603
GCVE (VulDB): GCVE-100-138832
scip Labs: https://www.scip.ch/en/?labs.20161013
See also: 🔍

Entryinfo

Created: 07/26/2019 08:02
Updated: 11/13/2023 08:33
Changes: 07/26/2019 08:02 (38), 01/01/2020 11:49 (24), 01/01/2020 11:50 (2), 11/13/2023 08:33 (7)
Complete: 🔍
Committer: misc
Cache ID: 216::103

VulDB is the best source for vulnerability data and more expert information about this specific topic.

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