CVE-2017-1000373 EXPLOIT
6.5
MEDIUM · CVSS 3.0 · EPSS 13.4% (pctl 96)
Patch early
A public exploit exists.
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.
Scoring
| CVSS | 6.5 (MEDIUM, v3.0) |
|---|---|
| Vector | CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L |
| EPSS | 13.38% — more likely to be exploited than 96% of all CVEs |
| Weakness | CWE-400 |
| On CISA KEV | no |
| Public exploit | yes |
| Published | 2017-06-19 |
| Last modified | 2026-06-17 |
Affected (1)
| Vendor | Product |
|---|---|
| openbsd | openbsd |
Public exploits
| Source | Title | Date |
|---|---|---|
| exploit-db | OpenBSD - 'at Stack Clash' Local Privilege Escalation | 2017-06-28 |
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
- 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
→ the Explorer · watch your stack · NVD