Denial of service in curl implementation for Command Line Interface, EAV Monitors, iRules components in F5 BIG-IP products



| Updated: 2023-10-28
Risk Low
Patch available NO
Number of vulnerabilities 1
CVE-ID CVE-2020-8285
CWE-ID CWE-674
Exploitation vector Network
Public exploit N/A
Vulnerable software
 BIG-IP DNS
Hardware solutions / Routers & switches, VoIP, GSM, etc

BIG-IP Link Controller
Hardware solutions / Routers & switches, VoIP, GSM, etc

BIG-IP AAM
Hardware solutions / Routers & switches, VoIP, GSM, etc

BIG-IP SSLO
Hardware solutions / Firmware

BIG-IP DDHD
Hardware solutions / Firmware

BIG-IP
Hardware solutions / Firmware

BIG-IP PEM
Hardware solutions / Security hardware applicances

BIG-IP GTM
Hardware solutions / Security hardware applicances

BIG-IP FPS
Hardware solutions / Security hardware applicances

BIG-IP ASM
Hardware solutions / Security hardware applicances

BIG-IP Analytics
Hardware solutions / Security hardware applicances

BIG-IP AFM
Hardware solutions / Security hardware applicances

BIG-IP LTM
Hardware solutions / Security hardware applicances

BIG-IP APM
Hardware solutions / Security hardware applicances

BIG-IP Advanced WAF
Client/Desktop applications / Antivirus software/Personal firewalls

Vendor F5 Networks

Security Bulletin

This security bulletin contains one low risk vulnerability.

1) Uncontrolled Recursion

EUVDB-ID: #VU48894

Risk: Low

CVSSv4.0: 1 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2020-8285

CWE-ID: CWE-674 - Uncontrolled Recursion

Exploit availability: No

Description

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

The vulnerability exists due tu uncontrolled recursion when processing FTP responses within the wildcard matching functionality, which allows a callback (set with <a href="https://curl.se/libcurl/c/CURLOPT_CHUNK_BGN_FUNCTION.html">CURLOPT_CHUNK_BGN_FUNCTION</a>) to return information back to libcurl on how to handle a specific entry in a directory when libcurl iterates over a list of all available entries. A remote attacker who controls the malicious FTP server can trick the victim to connect to it and crash the application, which is using the affected libcurl version.

Mitigation

Cybersecurity Help is currently unaware of any official solution to address this vulnerability.

Vulnerable software versions

BIG-IP DNS: 13.1.0 - 16.0.1.1

BIG-IP SSLO: 13.1.0 - 16.0.1.1

BIG-IP PEM: 13.1.0 - 16.0.1.1

BIG-IP Link Controller: 13.1.0 - 16.0.1.1

BIG-IP GTM: 13.1.0 - 16.0.1.1

BIG-IP FPS: 13.1.0 - 16.0.1.1

BIG-IP DDHD: 13.1.0 - 16.0.1.1

BIG-IP ASM: 13.1.0 - 16.0.1.1

BIG-IP Analytics: 13.1.0 - 16.0.1.1

BIG-IP AFM: 13.1.0 - 16.0.1.1

BIG-IP Advanced WAF: 13.1.0 - 16.0.1.1

BIG-IP AAM: 13.1.0 - 16.0.1.1

BIG-IP LTM: 13.1.0 - 16.0.1.1

BIG-IP: 13.1.0 - 16.0.1.1

BIG-IP APM: 13.1.0 - 16.0.1.1

CPE2.3 External links

http://support.f5.com/csp/article/K61186963


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 device 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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