Linux Kernel up to 4.19.2 Crypto User Configuration API crypto/crypto_user.c crypto_report_one information disclosure

CVSS Meta Temp Score
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CTI Interest Score
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3.9$0-$5k0.00

Summaryinfo

A vulnerability was found in Linux Kernel up to 4.19.2. It has been classified as problematic. The impacted element is the function crypto_report_one of the file crypto/crypto_user.c of the component Crypto User Configuration API. The manipulation leads to information disclosure. This vulnerability is referenced as CVE-2018-19854. The attack can only be performed from a local environment. No exploit is available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability was found in Linux Kernel up to 4.19.2 (Operating System). It has been rated as problematic. This issue affects the function crypto_report_one of the file crypto/crypto_user.c of the component Crypto User Configuration API. 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. The summary by CVE is:

An issue was discovered in the Linux kernel before 4.19.3. crypto_report_one() and related functions in crypto/crypto_user.c (the crypto user configuration API) do not fully initialize structures that are copied to userspace, potentially leaking sensitive memory to user programs. NOTE: this is a CVE-2013-2547 regression but with easier exploitability because the attacker does not need a capability (however, the system must have the CONFIG_CRYPTO_USER kconfig option).

The bug was discovered 11/09/2018. The weakness was published 12/04/2018 by Jann Horn with Google (Website). It is possible to read the advisory at git.kernel.org. The identification of this vulnerability is CVE-2018-19854 since 12/04/2018. Attacking locally is a requirement. The requirement for exploitation is a simple authentication. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1592 according to MITRE ATT&CK.

The vulnerability was handled as a non-public zero-day exploit for at least 25 days. During that time the estimated underground price was around $0-$5k. The vulnerability scanner Nessus provides a plugin with the ID 121289 (openSUSE Security Update : the Linux Kernel (openSUSE-2019-65)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family SuSE Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 171998 (OpenSUSE Security Update for the Linux Kernel (openSUSE-SU-2019:0065-1)).

Upgrading to version 4.19.3 eliminates this vulnerability. A possible mitigation has been published 4 months after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Tenable (121289) and SecurityFocus (BID 106537†). Similar entries are available at VDB-63774, VDB-119385, VDB-127414 and VDB-127693. Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 4.0
VulDB Meta Temp Score: 3.9

VulDB Base Score: 3.3
VulDB Temp Score: 3.2
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 4.7
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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Nessus ID: 121289
Nessus Name: openSUSE Security Update : the Linux Kernel (openSUSE-2019-65)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

Reaction Time: 🔍
0-Day Time: 🔍
Exposure Time: 🔍

Upgrade: Kernel 4.19.3
Patch: git.kernel.org

Timelineinfo

11/09/2018 🔍
12/04/2018 +25 days 🔍
12/04/2018 +0 days 🔍
12/04/2018 +0 days 🔍
12/05/2018 +1 days 🔍
01/11/2019 +37 days 🔍
01/22/2019 +11 days 🔍
03/23/2019 +60 days 🔍
06/12/2023 +1542 days 🔍

Sourcesinfo

Vendor: kernel.org

Advisory: RHSA-2019:3309
Researcher: Jann Horn
Organization: Google
Status: Confirmed

CVE: CVE-2018-19854 (🔍)
GCVE (CVE): GCVE-0-2018-19854
GCVE (VulDB): GCVE-100-127475
SecurityFocus: 106537 - PolicyKit CVE-2019-6133 Unauthorized Access Vulnerability

See also: 🔍

Entryinfo

Created: 12/05/2018 08:17
Updated: 06/12/2023 17:33
Changes: 12/05/2018 08:17 (80), 04/17/2020 11:53 (6), 06/12/2023 17:33 (5)
Complete: 🔍
Cache ID: 216:845:103

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

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