CVE-2017-1086 Information

Description

In FreeBSD before 11.1-STABLE 11.1-RELEASE-p4 11.0-RELEASE-p15 10.4-STABLE 10.4-RELEASE-p3 and 10.3-RELEASE-p24 not all information in the struct ptrace_lwpinfo is relevant for the state of any thread and the kernel does not fill the irrelevant bytes or short strings. Since the structure filled by the kernel is allocated on the kernel stack and copied to userspace a leak of information of the kernel stack of the thread is possible from the debugger. As a result some bytes from the kernel stack of the thread using ptrace (PT_LWPINFO) call can be observed in userspace.

CVSS Vector

CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

Reference

http://www.securityfocus.com/bid/101861 http://www.securitytracker.com/id/1039809 https://www.freebsd.org/security/advisories/FreeBSD-SA-17:08.ptrace.asc

Attack Complexity

LOW

Privileges Required

LOW

User Interaction Required

LOW

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

LOW

Availability Impact

NONE

Base Score

NONE

Base Severity

3.3