Linux Kernel up to 4.14.12 crypto/pcrypt.c System Calls resource management

CVSS Meta Temp Score
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CTI Interest Score
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6.4$0-$5k0.00

Summaryinfo

A vulnerability classified as critical was found in Linux Kernel up to 4.14.12. Affected is an unknown function of the file crypto/pcrypt.c. Such manipulation as part of System Calls leads to resource management. This vulnerability is traded as CVE-2017-18075. An attack has to be approached locally. There is no exploit available. It is advisable to implement a patch to correct this issue.

Detailsinfo

A vulnerability was found in Linux Kernel up to 4.14.12 (Operating System). It has been rated as critical. Affected by this issue is an unknown function of the file crypto/pcrypt.c. The manipulation as part of a System Calls leads to a resource management vulnerability. Using CWE to declare the problem leads to CWE-399. Impacted is confidentiality, integrity, and availability. CVE summarizes:

crypto/pcrypt.c in the Linux kernel before 4.14.13 mishandles freeing instances, allowing a local user able to access the AF_ALG-based AEAD interface (CONFIG_CRYPTO_USER_API_AEAD) and pcrypt (CONFIG_CRYPTO_PCRYPT) to cause a denial of service (kfree of an incorrect pointer) or possibly have unspecified other impact by executing a crafted sequence of system calls.

The bug was discovered 12/22/2017. The weakness was shared 01/24/2018 as confirmed git commit (GIT Repository). The advisory is shared for download at git.kernel.org. This vulnerability is handled as CVE-2017-18075 since 01/24/2018. The exploitation is known to be easy. The attack needs to be approached locally. No form of authentication is required for exploitation. There are known technical details, but no exploit is available.

The vulnerability was handled as a non-public zero-day exploit for at least 33 days. During that time the estimated underground price was around $0-$5k. The vulnerability scanner Nessus provides a plugin with the ID 108842 (Ubuntu 16.04 LTS : linux, linux-aws, linux-kvm, linux-raspi2, linux-snapdragon vulnerabilities (USN-3619-1)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Ubuntu Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 237034 (Red Hat Update for kernel-alt (RHSA-2018:2948)).

Upgrading to version 4.14.13 eliminates this vulnerability. Applying a patch is able to eliminate this problem. The bugfix is ready for download at git.kernel.org. The best possible mitigation is suggested to be patching the affected component. A possible mitigation has been published 3 months after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Tenable (108842) and SecurityFocus (BID 102813†). The entries VDB-109193, VDB-110288, VDB-110931 and VDB-110932 are related to this item. Once again VulDB remains the best 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: 6.5
VulDB Meta Temp Score: 6.4

VulDB Base Score: 5.3
VulDB Temp Score: 5.1
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 7.8
NVD Vector: 🔍

CVSSv2info

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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Resource management
CWE: CWE-399 / CWE-404
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: 108842
Nessus Name: Ubuntu 16.04 LTS : linux, linux-aws, linux-kvm, linux-raspi2, linux-snapdragon vulnerabilities (USN-3619-1)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 61945
OpenVAS Name: Ubuntu Update for linux-aws USN-3619-2
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

Interest: 🔍
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Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Patch
Status: 🔍

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

Upgrade: Kernel 4.14.13
Patch: git.kernel.org

Timelineinfo

12/22/2017 🔍
01/24/2018 +32 days 🔍
01/24/2018 +0 days 🔍
01/24/2018 +0 days 🔍
01/24/2018 +0 days 🔍
01/24/2018 +0 days 🔍
04/04/2018 +70 days 🔍
04/05/2018 +1 days 🔍
02/02/2023 +1764 days 🔍

Sourcesinfo

Vendor: kernel.org

Advisory: USN-3619-1
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2017-18075 (🔍)
GCVE (CVE): GCVE-0-2017-18075
GCVE (VulDB): GCVE-100-112364
SecurityFocus: 102813

See also: 🔍

Entryinfo

Created: 01/24/2018 14:28
Updated: 02/02/2023 14:08
Changes: 01/24/2018 14:28 (81), 12/27/2019 08:57 (3), 02/01/2021 15:27 (4), 02/02/2023 14:02 (3), 02/02/2023 14:08 (1)
Complete: 🔍
Cache ID: 216::103

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