Linux Kernel up to 4.13.4 ptrace.c flush_tmregs_to_thread memory corruption

CVSS Meta Temp Score
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CTI Interest Score
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4.3$0-$5k0.00

A vulnerability has been found in Linux Kernel up to 4.13.4 (Operating System) and classified as problematic. This vulnerability affects the function flush_tmregs_to_thread of the file arch/powerpc/kernel/ptrace.c. The manipulation with an unknown input leads to a memory corruption vulnerability. The CWE definition for the vulnerability is CWE-119. The product performs operations on a memory buffer, but it can read from or write to a memory location that is outside of the intended boundary of the buffer. As an impact it is known to affect availability. CVE summarizes:

In the flush_tmregs_to_thread function in arch/powerpc/kernel/ptrace.c in the Linux kernel before 4.13.5, a guest kernel crash can be triggered from unprivileged userspace during a core dump on a POWER host due to a missing processor feature check and an erroneous use of transactional memory (TM) instructions in the core dump path, leading to a denial of service.

The bug was discovered 03/19/2018. The weakness was shared 03/27/2018 with Qihoo 360 Vulcan Team as confirmed git commit (GIT Repository). The advisory is available at git.kernel.org. This vulnerability was named CVE-2018-1091 since 12/04/2017. Local access is required to approach this attack. No form of authentication is required for a successful exploitation. Technical details are known, but there is no available exploit.

The vulnerability was handled as a non-public zero-day exploit for at least 8 days. During that time the estimated underground price was around $0-$5k. The vulnerability scanner Nessus provides a plugin with the ID 109103 (openSUSE Security Update : the Linux Kernel (openSUSE-2018-377)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family SuSE Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 351257 (Amazon Linux Security Advisory for kernel: ALAS-2018-1023).

Upgrading to version 4.13.5 eliminates this vulnerability. Applying a patch is able to eliminate this problem. The bugfix is ready for download at git.kernel.org. The best possible mitigation is suggested to be patching the affected component. A possible mitigation has been published 3 weeks after the disclosure of the vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (109103). The entries 109965, 110554, 111442 and 113070 are related to this item.

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CPE 2.3info

CPE 2.2info

CVSSv4info

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CVSSv3info

VulDB Meta Base Score: 4.4
VulDB Meta Temp Score: 4.3

VulDB Base Score: 3.3
VulDB Temp Score: 3.2
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VulDB Reliability: 🔍

NVD Base Score: 5.5
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CVSSv2info

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Exploitinginfo

Class: Memory corruption
CWE: CWE-119
ATT&CK: Unknown

Local: Yes
Remote: No

Availability: 🔍
Status: Not defined

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EPSS Percentile: 🔍

Price Prediction: 🔍
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Nessus ID: 109103
Nessus Name: openSUSE Security Update : the Linux Kernel (openSUSE-2018-377)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 861397
OpenVAS Name: SuSE Update for Linux Kernel openSUSE-SU-2018:0972-1 (Linux Kernel)
OpenVAS File: 🔍
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Qualys ID: 🔍
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Threat Intelligenceinfo

Interest: 🔍
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Countermeasuresinfo

Recommended: Patch
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Upgrade: Kernel 4.13.5
Patch: git.kernel.org

Timelineinfo

12/04/2017 🔍
03/19/2018 +105 days 🔍
03/27/2018 +8 days 🔍
03/27/2018 +0 days 🔍
03/28/2018 +1 days 🔍
04/10/2018 +13 days 🔍
04/17/2018 +7 days 🔍
04/18/2018 +1 days 🔍
02/24/2023 +1773 days 🔍

Sourcesinfo

Vendor: kernel.org

Advisory: RHSA-2018:1318
Researcher: Yuki Chen
Organization: Qihoo 360 Vulcan Team
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2018-1091 (🔍)
SecurityFocus: 103603 - Microsoft Internet Explorer Scripting Engine CVE-2018-1000 Information Disclosure Vulnerability

See also: 🔍

Entryinfo

Created: 03/28/2018 10:33
Updated: 02/24/2023 12:28
Changes: 03/28/2018 10:33 (81), 01/17/2020 09:47 (6), 02/06/2021 10:13 (3), 02/24/2023 12:28 (3)
Complete: 🔍

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