CVE-2017-1086

low-risk
Published 2017-11-16

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.

Do I need to act?

-
0.07% chance of exploitation
EPSS score — low exploit probability
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Not on CISA KEV list
No confirmed active exploitation reported to CISA
?
Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
3
CVSS 3.3/10 Low
LOCAL / LOW complexity

Affected Products (1)

Affected Vendors

Freebsd

References (6)

Third Party Advisory http://www.securityfocus.com/bid/101861
Third Party Advisory http://www.securitytracker.com/id/1039809
Vendor Advisory https://www.freebsd.org/security/advisories/FreeBSD-SA-17:08.ptrace.asc
Third Party Advisory http://www.securityfocus.com/bid/101861
Third Party Advisory http://www.securitytracker.com/id/1039809
Vendor Advisory https://www.freebsd.org/security/advisories/FreeBSD-SA-17:08.ptrace.asc
18
/ 100
low-risk
Severity 13/34 · Low
Exploitability 0/34 · Minimal
Exposure 5/34 · Minimal