Denial of service in ModSecurity



Published: 2020-09-16
Risk Medium
Patch available NO
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
Client/Desktop applications / Antivirus software/Personal firewalls

Vendor Trustwave

Security Advisory

This security advisory describes one medium risk vulnerability.

1) Resource exhaustion

Risk: Medium

CVSSv3: 6.7 [CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:W/RC:C] [PCI]

CVE-ID: CVE-2020-15598

CWE-ID: CWE-400 - Uncontrolled Resource Consumption ('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

A patch is available in vendor's repository:

https://gist.githubusercontent.com/crsgists/0e1f6f7f1bd1f239ded64cecee46a11d/raw/181bc852065e9782367f1dc67c96d4d250e73a46/cve-2020-15598.patch


Vulnerable software versions

ModSecurity: 3.0.0, 3.0.1, 3.0.2, 3.0.3, 3.0.4

CPE External links

https://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.

Is there known malware, which exploits this vulnerability?

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