Red Hat Enterprise Linux up to 4.x Kernel crypto/authenc.c crypto_authenc_extractkeys out-of-bounds

Summaryinfo

A vulnerability marked as critical has been reported in Red Hat Enterprise Linux up to 4.x. This issue affects the function crypto_authenc_extractkeys of the file crypto/authenc.c of the component Kernel. This manipulation causes out-of-bounds. This vulnerability is registered as CVE-2020-10769. The attack needs to be launched locally. No exploit is available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability has been found in Red Hat Enterprise Linux up to 4.x (Operating System) and classified as critical. Affected by this vulnerability is the function crypto_authenc_extractkeys of the file crypto/authenc.c of the component Kernel. The manipulation with an unknown input leads to a out-of-bounds vulnerability. The CWE definition for the vulnerability is CWE-125. The product reads data past the end, or before the beginning, of the intended buffer. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

A buffer over-read flaw was found in RH kernel versions before 5.0 in crypto_authenc_extractkeys in crypto/authenc.c in the IPsec Cryptographic algorithm's module, authenc. When a payload longer than 4 bytes, and is not following 4-byte alignment boundary guidelines, it causes a buffer over-read threat, leading to a system crash. This flaw allows a local attacker with user privileges to cause a denial of service.

The weakness was published 06/26/2020 as Bug 1708775 as not defined bug report (Bugzilla). It is possible to read the advisory at bugzilla.redhat.com. This vulnerability is known as CVE-2020-10769 since 03/20/2020. Attacking locally is a requirement. A single authentication is needed for exploitation. Technical details of the vulnerability are known, but there is no available exploit.

The vulnerability scanner Nessus provides a plugin with the ID 208602 (CentOS 7 : kernel-alt (RHSA-2020:3545)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 5.0 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (208602). Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Type

• Operating System

Vendor

• Red Hat

Name

• Enterprise Linux

Version

• 4.x

License

• commercial

Website

• Vendor: https://www.redhat.com/

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

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