Linux Kernel up to 5.0.3 /proc/ioports use after free

Summaryinfo

A vulnerability was found in Linux Kernel up to 5.0.3. It has been classified as critical. This affects an unknown function of the file /proc/ioports. This manipulation causes use after free. This vulnerability is handled as CVE-2019-11811. The attack can be initiated remotely. There is not any exploit available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability classified as critical was found in Linux Kernel up to 5.0.3 (Operating System). Affected by this vulnerability is an unknown code block of the file /proc/ioports. The manipulation with an unknown input leads to a use after free vulnerability. The CWE definition for the vulnerability is CWE-416. Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

An issue was discovered in the Linux kernel before 5.0.4. There is a use-after-free upon attempted read access to /proc/ioports after the ipmi_si module is removed, related to drivers/char/ipmi/ipmi_si_intf.c, drivers/char/ipmi/ipmi_si_mem_io.c, and drivers/char/ipmi/ipmi_si_port_io.c.

The bug was discovered 02/19/2019. The weakness was released 05/07/2019 by Alex (Website). The advisory is shared at securityfocus.com. This vulnerability is known as CVE-2019-11811 since 05/07/2019. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Technical details are known, but no exploit is available.

The vulnerability was handled as a non-public zero-day exploit for at least 77 days. During that time the estimated underground price was around $5k-$25k. The commercial vulnerability scanner Qualys is able to test this issue with plugin 172474 (OpenSUSE Security Update for the Linux Kernel (openSUSE-SU-2019:1479-1)).

Upgrading to version 5.0.4 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at SecurityFocus (BID 106478†). Entries connected to this vulnerability are available at VDB-128716, VDB-134037, VDB-134452 and VDB-134460. If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

Type

• Operating System

Vendor

• Linux

Name

• Kernel

Version

• 5.0.0
• 5.0.1
• 5.0.2
• 5.0.3

License

• open-source

Website

• Vendor: https://www.kernel.org/

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If you want to get the best quality for vulnerability data then you always have to consider VulDB.

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