OpenBSD up to 6.1 qsort resource consumption

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6.6$0-$5k0.00

A vulnerability was found in OpenBSD up to 6.1 (Operating System). It has been classified as critical. Affected is the function qsort. The manipulation with an unknown input leads to a resource consumption vulnerability. CWE is classifying the issue as CWE-400. The product does not properly control the allocation and maintenance of a limited resource, thereby enabling an actor to influence the amount of resources consumed, eventually leading to the exhaustion of available resources. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

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.

The bug was discovered 06/19/2017. The weakness was presented 06/19/2017 with Qualys (Website). The advisory is available at exploit-db.com. This vulnerability is traded as CVE-2017-1000373 since 06/19/2017. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. Technical details and a public exploit are known. This vulnerability is assigned to T1499 by the MITRE ATT&CK project.

A public exploit has been developed by Qualys Corporation in ANSI C and been published 2 weeks after the advisory. The exploit is shared for download at exploit-db.com. It is declared as proof-of-concept. The commercial vulnerability scanner Qualys is able to test this issue with plugin 370434 (OpenBSD Advisory for kernel / glibc Elevation of Privileges (Stack Clash)).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the vulnerability database at Exploit-DB (42271). See 102677, 107049, 107050 and 107051 for similar entries.

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CPE 2.3info

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CVSSv3info

VulDB Meta Base Score: 6.9
VulDB Meta Temp Score: 6.7

VulDB Base Score: 7.3
VulDB Temp Score: 6.9
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NVD Base Score: 6.5
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Exploitinginfo

Class: Resource consumption
CWE: CWE-400 / CWE-404
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ATT&CK: 🔍

Local: No
Remote: Yes

Availability: 🔍
Access: Public
Status: Proof-of-Concept
Author: Qualys Corporation
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OpenVAS ID: 801105
OpenVAS Name: Apple Mac OS X Multiple Vulnerabilities-HT208144
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Countermeasuresinfo

Recommended: no mitigation known
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Timelineinfo

06/19/2017 🔍
06/19/2017 +0 days 🔍
06/19/2017 +0 days 🔍
06/19/2017 +0 days 🔍
06/20/2017 +1 days 🔍
06/21/2017 +1 days 🔍
06/28/2017 +7 days 🔍
06/28/2017 +0 days 🔍
12/29/2020 +1280 days 🔍

Sourcesinfo

Advisory: exploit-db.com
Researcher: Qualys Research Labs
Organization: Qualys
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2017-1000373 (🔍)
SecurityTracker: 1039427
SecurityFocus: 99177 - OpenBSD CVE-2017-1000373 Denial of Service Vulnerability

scip Labs: https://www.scip.ch/en/?labs.20161013
See also: 🔍

Entryinfo

Created: 06/20/2017 08:08
Updated: 12/29/2020 09:39
Changes: 06/20/2017 08:08 (70), 10/21/2019 16:52 (9), 12/29/2020 09:35 (3), 12/29/2020 09:39 (1)
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