PT-2017-1725 · Openbsd · Openbsd

Jesse Hertz · Published 2017-03-07 · Updated 2017-03-09 · CVE-2016-6243

Positive Technologies (AI Summary)

CVSS v3.1

5.5

Medium

Base vector

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

Name of the Vulnerable Software and Affected Versions OpenBSD versions 5.8 through 5.9

Description The issue is related to insufficient input validation in the thrsleep function in kern/kern synch.c. This allows a local user to cause a denial of service, specifically a kernel panic, by providing a crafted value in the tsp parameter of the thrsleep system call.

Recommendations For OpenBSD versions 5.8 and 5.9, consider restricting access to the thrsleep system call until a patch is available. As a temporary workaround, avoid using the tsp parameter in the thrsleep system call to minimize the risk of exploitation.

Exploit

Fix

RCE

Weakness Enumeration

CWE-20

Related Identifiers

BDU:2017-00878

CVE-2016-6243

Affected Products

Openbsd

References · 8

• 🔥 http://openwall.com/lists/oss-security/2016/07/17/7 · Exploit
• https://osv.dev/vulnerability/CVE-2016-6243 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2016-6243 · Security Note
• https://bdu.fstec.ru/vul/2017-00878 · Security Note
• http://openbsd.org/errata58.html · Note
• http://openwall.com/lists/oss-security/2016/07/14/5 · Note
• http://securityfocus.com/bid/91805 · Note
• http://openbsd.org/errata59.html · Note