CVE-2017-1000373

MEDIUM

Description

The OpenBSD qsort() function is recursive, and not randomized, an attacker can construct a pathological input array of N elements that causes qsort() to deterministically recurse N/4 times. This allows attackers to consume arbitrary amounts of stack memory and manipulate stack memory to assist in arbitrary code execution attacks. This affects OpenBSD 6.1 and possibly earlier versions.

References

http://www.securityfocus.com/bid/99177

http://www.securitytracker.com/id/1039427

https://cvsweb.openbsd.org/cgi-bin/cvsweb/src/lib/libc/stdlib/qsort.c?rev=1.15&content-type=text/x-cvsweb-markup

https://support.apple.com/HT208112

https://support.apple.com/HT208113

https://support.apple.com/HT208115

https://support.apple.com/HT208144

https://www.exploit-db.com/exploits/42271/

https://www.qualys.com/2017/06/19/stack-clash/stack-clash.txt

Details

Source: MITRE

Published: 2017-06-19

Updated: 2017-10-24

Type: CWE-400

Risk Information

CVSS v2.0

Base Score: 6.4

Vector: AV:N/AC:L/Au:N/C:N/I:P/A:P

Impact Score: 4.9

Exploitability Score: 10

Severity: MEDIUM

CVSS v3.0

Base Score: 6.5

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

Impact Score: 2.5

Exploitability Score: 3.9

Severity: MEDIUM