Summaryinfo

A vulnerability was found in Linux Kernel up to 4.17.1. It has been rated as problematic. This issue affects some unknown processing of the file arch/x86/kvm/vmx.c. The manipulation leads to access control. The identification of this vulnerability is CVE-2018-12904. The attack needs to be approached locally. Furthermore, there is an exploit available. It is recommended to upgrade the affected component. Once again VulDB remains the best source for vulnerability data.

Detailsinfo

A vulnerability was found in Linux Kernel up to 4.17.1 (Operating System). It has been declared as problematic. This vulnerability affects an unknown part of the file arch/x86/kvm/vmx.c. The manipulation with an unknown input leads to a access control vulnerability. The CWE definition for the vulnerability is CWE-264. As an impact it is known to affect availability. CVE summarizes:

In arch/x86/kvm/vmx.c in the Linux kernel before 4.17.2, when nested virtualization is used, local attackers could cause L1 KVM guests to VMEXIT, potentially allowing privilege escalations and denial of service attacks due to lack of checking of CPL.

The bug was discovered 06/06/2018. The weakness was shared 06/27/2018 (Website). The advisory is shared for download at git.kernel.org. This vulnerability was named CVE-2018-12904 since 06/27/2018. The attack needs to be approached locally. No form of authentication is required for a successful exploitation. Technical details and also a public exploit are known. The MITRE ATT&CK project declares the attack technique as T1068.

It is possible to download the exploit at exploit-db.com. It is declared as proof-of-concept. The vulnerability was handled as a non-public zero-day exploit for at least 21 days. During that time the estimated underground price was around $0-$5k. The vulnerability scanner Nessus provides a plugin with the ID 110789 (Fedora 27 : kernel / kernel-tools (2018-b997780dca)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Fedora Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 197240 (Ubuntu Security Notification for Linux, Linux-aws, Linux-gcp, Linux-kvm, Linux-raspi2 Vulnerabilities (USN-3752-1)).

Upgrading to version 4.17.2 eliminates this vulnerability. A possible mitigation has been published 1 days after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Exploit-DB (44944) and Tenable (110789). The entries VDB-118176, VDB-118953 and VDB-121521 are related to this item. Once again VulDB remains the best source for vulnerability data.

Productinfo

Type

• Operating System

Vendor

• Linux

Name

• Kernel

Version

• 4.17.0
• 4.17.1

License

• open-source

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