Linux Kernel up to 5.3.13 Spectre-RSB Mitigation entry_64.S information disclosure

Summaryinfo

A vulnerability was found in Linux Kernel up to 5.3.13. It has been classified as problematic. This affects an unknown function of the file arch/powerpc/kernel/entry_64.S of the component Spectre-RSB Mitigation. This manipulation causes information disclosure. This vulnerability appears as CVE-2019-18660. The attack requires local access. There is no available exploit.

Detailsinfo

A vulnerability was found in Linux Kernel up to 5.3.13 (Operating System). It has been declared as problematic. Affected by this vulnerability is an unknown code block of the file arch/powerpc/kernel/entry_64.S of the component Spectre-RSB Mitigation. The manipulation with an unknown input leads to a information disclosure vulnerability. The CWE definition for the vulnerability is CWE-200. The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information. As an impact it is known to affect confidentiality. The summary by CVE is:

The Linux kernel through 5.3.13 on powerpc allows Information Exposure because the Spectre-RSB mitigation is not in place for all applicable CPUs, aka CID-39e72bf96f58. This is related to arch/powerpc/kernel/entry_64.S and arch/powerpc/kernel/security.c.

The weakness was presented 11/27/2019 (oss-sec). The advisory is shared at openwall.com. This vulnerability is known as CVE-2019-18660 since 11/02/2019. An attack has to be approached locally. The exploitation doesn't need any form of authentication. Technical details are known, but no exploit is available. MITRE ATT&CK project uses the attack technique T1592 for this issue.

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.

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 Tenable (208574). See VDB-146477 and VDB-146476 for similar entries. Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Type

• Operating System

Vendor

• Linux

Name

• Kernel

Version

• 5.3.0
• 5.3.1
• 5.3.2
• 5.3.3
• 5.3.4
• 5.3.5
• 5.3.6
• 5.3.7
• 5.3.8
• 5.3.9
• 5.3.10
• 5.3.11
• 5.3.12
• 5.3.13

License

• open-source

Website

• Vendor: https://www.kernel.org/

CPE 2.3info

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CPE 2.2info

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Entryinfo

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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