CVE-2017-1000373

OpenBSD - 'at Stack Clash' Local Privilege Escalation

Severity Score

6.5

*CVSS v3

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

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.

La función qsort() de OpenBSD es recursiva y no aleatorizada, por lo que un atacante puede construir un array de entrada patológica de elementos N que provoca que qsort() se repita inevitablemente N/4 veces. Esto permite que los atacantes consuman cantidades de memoria de pila arbitrarias y manipulen la memoria de pila para ayudar en los ataques de ejecución de código arbitrario. Esto afecta a OpenBSD 6.1 y, posiblemente, a versiones anteriores.

*Credits: N/A

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

Low

Availability

Low

Attack Vector

Network

Attack Complexity

Low

Authentication

None

Confidentiality

None

Integrity

Partial

Availability

Partial

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2017-06-19 CVE Reserved
2017-06-19 CVE Published
2023-05-30 EPSS Updated
2024-08-05 CVE Updated
2024-08-05 First Exploit
---------- Exploited in Wild
---------- KEV Due Date

CWE

CWE-400: Uncontrolled Resource Consumption

CAPEC

References (9)

URL	Tag	Source
http://www.securityfocus.com/bid/99177	Third Party Advisory
http://www.securitytracker.com/id/1039427	Vdb Entry
https://cvsweb.openbsd.org/cgi-bin/cvsweb/src/lib/libc/stdlib/qsort.c?rev=1.15&content-type=text/x-cvsweb-markup	Mitigation
https://support.apple.com/HT208112	X_refsource_confirm
https://support.apple.com/HT208113	X_refsource_confirm
https://support.apple.com/HT208115	X_refsource_confirm
https://support.apple.com/HT208144	X_refsource_confirm
https://www.qualys.com/2017/06/19/stack-clash/stack-clash.txt	Third Party Advisory

URL	Date	SRC
https://www.exploit-db.com/exploits/42271	2024-08-05

URL	Date	SRC

URL	Date	SRC

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Openbsd Search vendor "Openbsd"		Openbsd Search vendor "Openbsd" for product "Openbsd"				<= 6.1 Search vendor "Openbsd" for product "Openbsd" and version " <= 6.1"		-		Affected