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Vulnerability Details : CVE-2017-1000255

On Linux running on PowerPC hardware (Power8 or later) a user process can craft a signal frame and then do a sigreturn so that the kernel will take an exception (interrupt), and use the r1 value *from the signal frame* as the kernel stack pointer. As part of the exception entry the content of the signal frame is written to the kernel stack, allowing an attacker to overwrite arbitrary locations with arbitrary values. The exception handling does produce an oops, and a panic if panic_on_oops=1, but only after kernel memory has been over written. This flaw was introduced in commit: "5d176f751ee3 (powerpc: tm: Enable transactional memory (TM) lazily for userspace)" which was merged upstream into v4.9-rc1. Please note that kernels built with CONFIG_PPC_TRANSACTIONAL_MEM=n are not vulnerable.
Publish Date : 2017-10-30 Last Update Date : 2018-04-10
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- CVSS Scores & Vulnerability Types

CVSS Score
6.6
Confidentiality Impact None (There is no impact to the confidentiality of the system.)
Integrity Impact Complete (There is a total compromise of system integrity. There is a complete loss of system protection, resulting in the entire system being compromised.)
Availability Impact Complete (There is a total shutdown of the affected resource. The attacker can render the resource completely unavailable.)
Access Complexity Low (Specialized access conditions or extenuating circumstances do not exist. Very little knowledge or skill is required to exploit. )
Authentication Not required (Authentication is not required to exploit the vulnerability.)
Gained Access None
Vulnerability Type(s)
CWE ID 787

- Related OVAL Definitions

Title Definition Id Class Family
RHSA-2018:0654: kernel-alt security, bug fix, and enhancement update (Important) oval:com.redhat.rhsa:def:20180654 unix
OVAL (Open Vulnerability and Assessment Language) definitions define exactly what should be done to verify a vulnerability or a missing patch. Check out the OVAL definitions if you want to learn what you should do to verify a vulnerability.

- Products Affected By CVE-2017-1000255

# Product Type Vendor Product Version Update Edition Language
1 OS Linux Linux Kernel - Version Details Vulnerabilities

- Number Of Affected Versions By Product

Vendor Product Vulnerable Versions
Linux Linux Kernel 1

- References For CVE-2017-1000255

https://access.redhat.com/security/cve/CVE-2017-1000255
https://access.redhat.com/errata/RHSA-2018:0654
REDHAT RHSA-2018:0654
http://www.securityfocus.com/bid/101264
BID 101264

- Vulnerability Conditions

Vulnerability is valid if product versions listed below are used TOGETHER WITH(AND)

- Metasploit Modules Related To CVE-2017-1000255

There are not any metasploit modules related to this CVE entry (Please visit www.metasploit.com for more information)
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