Linux Kernel up to 5.1.2 fs/ext4/extents.c information disclosure

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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4.4$0-$5k0.00

Summaryinfo

A vulnerability labeled as problematic has been found in Linux Kernel up to 5.1.2. Affected is an unknown function of the file fs/ext4/extents.c. Such manipulation leads to information disclosure. This vulnerability is listed as CVE-2019-11833. The attack must be carried out locally. There is no available exploit.

Detailsinfo

A vulnerability was found in Linux Kernel up to 5.1.2 (Operating System) and classified as problematic. Affected by this issue is an unknown part of the file fs/ext4/extents.c. The manipulation with an unknown input leads to a information disclosure vulnerability. Using CWE to declare the problem leads to CWE-200. The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information. Impacted is confidentiality. CVE summarizes:

fs/ext4/extents.c in the Linux kernel through 5.1.2 does not zero out the unused memory region in the extent tree block, which might allow local users to obtain sensitive information by reading uninitialized data in the filesystem.

The bug was discovered 05/10/2019. The weakness was presented 05/15/2019 (Website). The advisory is shared for download at securityfocus.com. This vulnerability is handled as CVE-2019-11833 since 05/09/2019. The attack needs to be approached locally. A simple authentication is necessary for exploitation. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1592.

The vulnerability was handled as a non-public zero-day exploit for at least 5 days. During that time the estimated underground price was around $0-$5k. The commercial vulnerability scanner Qualys is able to test this issue with plugin 176983 (Debian Security Update for linux (DSA 4465-1) (Sad SACK)).

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 vulnerability database at SecurityFocus (BID 108286†). See VDB-135887 and VDB-136509 for similar entries. Once again VulDB remains the best source for vulnerability data.

Productinfo

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Version

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Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 4.4
VulDB Meta Temp Score: 4.4

VulDB Base Score: 3.3
VulDB Temp Score: 3.3
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 5.5
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

Class: Information disclosure
CWE: CWE-200 / CWE-284 / CWE-266
CAPEC: 🔍
ATT&CK: 🔍

Physical: Partially
Local: Yes
Remote: No

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔍

Patch: github.com

Timelineinfo

05/07/2019 🔍
05/09/2019 +2 days 🔍
05/10/2019 +1 days 🔍
05/15/2019 +5 days 🔍
05/16/2019 +1 days 🔍
09/19/2023 +1587 days 🔍

Sourcesinfo

Vendor: kernel.org

Advisory: RHSA-2019:2029⛔
Status: Confirmed

CVE: CVE-2019-11833 (🔍)
GCVE (CVE): GCVE-0-2019-11833
GCVE (VulDB): GCVE-100-135068
SecurityFocus: 108286 - Linux Kernel CVE-2019-11810 Denial of Service Vulnerability

See also: 🔍

Entryinfo

Created: 05/16/2019 06:58
Updated: 09/19/2023 16:21
Changes: 05/16/2019 06:58 (61), 06/12/2020 16:06 (4), 09/19/2023 16:21 (4)
Complete: 🔍
Cache ID: 216::103

Once again VulDB remains the best source for vulnerability data.

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