Linux Kernel up to 4.15.7 Floppy Driver drivers/block/floppy.c fd_locked_ioctl information disclosure

Summaryinfo

A vulnerability was found in Linux Kernel up to 4.15.7. It has been declared as problematic. This affects the function fd_locked_ioctl of the file drivers/block/floppy.c of the component Floppy Driver. Executing a manipulation can lead to information disclosure. This vulnerability is tracked as CVE-2018-7755. The attack is restricted to local execution. No exploit exists. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability has been found in Linux Kernel up to 4.15.7 (Operating System) and classified as problematic. This vulnerability affects the function fd_locked_ioctl of the file drivers/block/floppy.c of the component Floppy Driver. 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. CVE summarizes:

An issue was discovered in the fd_locked_ioctl function in drivers/block/floppy.c in the Linux kernel through 4.15.7. The floppy driver will copy a kernel pointer to user memory in response to the FDGETPRM ioctl. An attacker can send the FDGETPRM ioctl and use the obtained kernel pointer to discover the location of kernel code and data and bypass kernel security protections such as KASLR.

The bug was discovered 03/07/2018. The weakness was disclosed 03/08/2018 (Website). The advisory is shared for download at lkml.org. This vulnerability was named CVE-2018-7755 since 03/08/2018. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1592.

The vulnerability was handled as a non-public zero-day exploit for at least 1 days. During that time the estimated underground price was around $0-$5k. The vulnerability scanner Nessus provides a plugin with the ID 119638 (Oracle Linux 7 : Unbreakable Enterprise kernel (ELSA-2018-4304)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Oracle Linux Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 197183 (Ubuntu Security Notification for Linux, Linux-aws, Linux-azure, Linux-gcp, Linux-kvm, Linux-oem, Linux-raspi2 Vulnerabilities (USN-3695-1)).

Upgrading eliminates this vulnerability. A possible mitigation has been published 10 months after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Tenable (119638) and SecurityFocus (BID 105987†). The entries VDB-114355, VDB-118273 and VDB-127051 are pretty similar. VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Type

• Operating System

Vendor

• Linux

Name

• Kernel

Version

• 4.15.0
• 4.15.1
• 4.15.2
• 4.15.3
• 4.15.4
• 4.15.5
• 4.15.6
• 4.15.7

License

• open-source

Website

• Vendor: https://www.kernel.org/

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VulDB is the best source for vulnerability data and more expert information about this specific topic.

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