Denial of service in ModSecurity



Published: 2020-09-16 | Updated: 2021-07-08
Risk Medium
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2020-15598
CWE-ID CWE-400
Exploitation vector Network
Public exploit N/A
Vulnerable software
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ModSecurity
Server applications / IDS/IPS systems, Firewalls and proxy servers

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Security Bulletin

This security bulletin contains information about 1 vulnerabilities.

Updated 08.07.2021

Added fixed version.

1) Resource exhaustion

EUVDB-ID: #VU46766

Risk: Medium

CVSSv3.1: 6.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-15598

CWE-ID: CWE-400 - Resource exhaustion

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to application does not properly control consumption of internal resources while performing global matching of regular expressions in a combination of the ModSecurity “capture” action. A remote attacker can send a specially crafted HTTP request to the server and perform a denial of service (DoS) attack.

Mitigation

Install update from vendor's website.

Vulnerable software versions

ModSecurity: 3.0.0 - 3.0.4

External links

http://coreruleset.org/20200914/cve-2020-15598/


Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

How the attacker can exploit this vulnerability?

The attacker would have to send a specially crafted request to the affected application in order to exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.



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