PT-2017-8989 · Openbsd · Openbsd

Jesse Hertz + 1 · Published 2017-03-07 · Updated 2017-03-09 · CVE-2016-6522

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 version 5.9

Description The issue is caused by an integer overflow in the uvm map isavail function, which can be triggered by a local user via a crafted mmap call. This results in a denial of service, specifically a kernel panic, when the new mapping overlaps with an existing mapping.

Recommendations For OpenBSD version 5.9, consider applying configuration changes to restrict the use of the mmap system call to minimize the risk of exploitation. As a temporary workaround, restrict access to the uvm map isavail function until a patch is available. At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Exploit

Integer Overflow

Weakness Enumeration

CWE-190

Related Identifiers

CVE-2016-6522

Affected Products

Openbsd

References · 6

• 🔥 http://openwall.com/lists/oss-security/2016/08/02/8 · Exploit
• 🔥 http://openwall.com/lists/oss-security/2016/08/02/12 · Exploit
• https://nvd.nist.gov/vuln/detail/CVE-2016-6522 · Security Note
• http://ftp.openbsd.org/pub/OpenBSD/patches/5.9/common/023_uvmisavail.patch.sig · Patch
• https://osv.dev/vulnerability/CVE-2016-6522 · Vendor Advisory
• http://securityfocus.com/bid/92264 · Note