Linux Kernel up to 4.20.10 crypto/af_alg.c af_alg_release use after free

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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6.5$0-$5k0.00

Summaryinfo

A vulnerability classified as critical has been found in Linux Kernel up to 4.20.10. This impacts the function af_alg_release of the file crypto/af_alg.c. The manipulation leads to use after free. This vulnerability is uniquely identified as CVE-2019-8912. Local access is required to approach this attack. No exploit exists.

Detailsinfo

A vulnerability, which was classified as critical, has been found in Linux Kernel up to 4.20.10 (Operating System). This issue affects the function af_alg_release of the file crypto/af_alg.c. The manipulation with an unknown input leads to a use after free vulnerability. Using CWE to declare the problem leads to CWE-416. Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

In the Linux kernel through 4.20.10, af_alg_release() in crypto/af_alg.c neglects to set a NULL value for a certain structure member, which leads to a use-after-free in sockfs_setattr.

The bug was discovered 02/15/2019. The weakness was disclosed 02/18/2019 (Website). The advisory is shared at securityfocus.com. The identification of this vulnerability is CVE-2019-8912 since 02/18/2019. The exploitation is known to be easy. An attack has to be approached locally. 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 $0-$5k at the moment (estimation calculated on 10/15/2024).

The vulnerability was handled as a non-public zero-day exploit for at least 3 days. During that time the estimated underground price was around $0-$5k. The vulnerability scanner Nessus provides a plugin with the ID 208574 (CentOS 7 : kernel-alt (RHSA-2020:0174)), which helps to determine the existence of the flaw in a target environment. The commercial vulnerability scanner Qualys is able to test this issue with plugin 172169 (SUSE Enterprise Linux Security Update for the Linux Kernel (SUSE-SU-2019:0765-1)).

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 Tenable (208574) and SecurityFocus (BID 107120†). The entries VDB-130266, VDB-130406 and VDB-136769 are pretty similar. If you want to get the best quality for vulnerability data then you always have to consider VulDB.

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: 6.5
VulDB Meta Temp Score: 6.5

VulDB Base Score: 5.3
VulDB Temp Score: 5.3
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

Class: Use after free
CWE: CWE-416 / CWE-119
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: 208574
Nessus Name: CentOS 7 : kernel-alt (RHSA-2020:0174)

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔍

Timelineinfo

02/15/2019 🔍
02/18/2019 +3 days 🔍
02/18/2019 +0 days 🔍
02/18/2019 +0 days 🔍
02/19/2019 +1 days 🔍
10/15/2024 +2065 days 🔍

Sourcesinfo

Vendor: kernel.org

Advisory: RHSA-2020:0174⛔
Status: Confirmed

CVE: CVE-2019-8912 (🔍)
GCVE (CVE): GCVE-0-2019-8912
GCVE (VulDB): GCVE-100-130997
SecurityFocus: 107120 - Linux Kernel CVE-2019-8980 Denial of Service Vulnerability

See also: 🔍

Entryinfo

Created: 02/19/2019 08:20
Updated: 10/15/2024 17:40
Changes: 02/19/2019 08:20 (62), 05/11/2020 10:51 (4), 07/11/2023 10:37 (3), 10/15/2024 17:40 (16)
Complete: 🔍
Cache ID: 216::103

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