CVE-2017-1000255

CVSS V2 Medium 6.6 CVSS V3 Medium 5.5
Description
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.
Overview
  • CVE ID
  • CVE-2017-1000255
  • Assigner
  • cve@mitre.org
  • Vulnerability Status
  • Modified
  • Published Version
  • 2017-10-30T20:29:00
  • Last Modified Date
  • 2018-04-11T01:29:00
Weakness Enumerations
CWE URL
CWE-787 http://cwe.mitre.org/data/definitions/787.html
CPE Configuration (Product)
CPE Vulnerable Operator Version Start Version End
AND
cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:* 1 OR
cpe:2.3:h:ibm:powerpc_power8:-:*:*:*:*:*:*:* 0 OR
cpe:2.3:h:ibm:powerpc_power9:-:*:*:*:*:*:*:* 0 OR
CVSS Version 2
  • Version
  • 2.0
  • Vector String
  • AV:L/AC:L/Au:N/C:N/I:C/A:C
  • Access Vector
  • LOCAL
  • Access Compatibility
  • LOW
  • Authentication
  • NONE
  • Confidentiality Impact
  • NONE
  • Integrity Impact
  • COMPLETE
  • Availability Impact
  • COMPLETE
  • Base Score
  • 6.6
  • Severity
  • MEDIUM
  • Exploitability Score
  • 3.9
  • Impact Score
  • 9.2
CVSS Version 3
  • Version
  • 3.0
  • Vector String
  • CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
  • Attack Vector
  • LOCAL
  • Attack Compatibility
  • LOW
  • Privileges Required
  • LOW
  • User Interaction
  • NONE
  • Scope
  • UNCHANGED
  • Confidentiality Impact
  • NONE
  • Availability Impact
  • NONE
  • Base Score
  • 5.5
  • Base Severity
  • MEDIUM
  • Exploitability Score
  • 1.8
  • Impact Score
  • 3.6
References
Reference URL Reference Tags
https://access.redhat.com/security/cve/CVE-2017-1000255 Issue Tracking Third Party Advisory
http://www.securityfocus.com/bid/101264 Third Party Advisory VDB Entry
https://access.redhat.com/errata/RHSA-2018:0654
Sources
Source Name Source URL
NIST https://nvd.nist.gov/vuln/detail/CVE-2017-1000255
MITRE https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-1000255
History
Created Old Value New Value Data Type Notes
2022-05-10 18:45:48 Added to TrackCVE
2022-12-02 22:40:02 2017-10-30T20:29Z 2017-10-30T20:29:00 CVE Published Date updated
2022-12-02 22:40:02 2018-04-11T01:29:00 CVE Modified Date updated
2022-12-02 22:40:02 Modified Vulnerability Status updated