#VU9743 Improper input validation in F5 Networks products - CVE-2017-6138

Vulnerability identifier: #VU9743

Vulnerability risk: Low

CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2017-6138

CWE-ID: CWE-20

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
BIG-IP LTM
Hardware solutions / Security hardware applicances
BIG-IP AFM
Hardware solutions / Security hardware applicances
BIG-IP Analytics
Hardware solutions / Security hardware applicances
BIG-IP APM
Hardware solutions / Security hardware applicances
BIG-IP ASM
Hardware solutions / Security hardware applicances
BIG-IP GTM
Hardware solutions / Security hardware applicances
BIG-IP PEM
Hardware solutions / Security hardware applicances
BIG-IP AAM
Hardware solutions / Routers & switches, VoIP, GSM, etc
BIG-IP DNS
Hardware solutions / Routers & switches, VoIP, GSM, etc
BIG-IP Link Controller
Hardware solutions / Routers & switches, VoIP, GSM, etc
BIG-IP WebSafe
Server applications / Server solutions for antivurus protection

Vendor: F5 Networks

Description
The vulnerability allows a remote attacker to cause DoS condition on the target system.

The vulnerability exists on the systems with BIG-IP APM profiles and the systems with the non-default "normalize URI" configuration options used in iRules and/or BIG-IP LTM policies due to insufficient validation of user-supplied input. A remote attacker can send specially crafted requests to a target virtual server that has an HTTP profile, trigger an unspecified flaw and cause the Traffic Management Microkernel (TMM) to restart and traffic to disrupt.

Successful exploitation of the vulnerability results in denial of service.

Mitigation
The vulnerability is addressed in the following versions: 12.1.3, 13.1.0.

Vulnerable software versions

BIG-IP LTM: 12.1.0 - 13.0.0

BIG-IP AAM: 12.1.0 - 13.0.0

BIG-IP AFM: 12.1.0 - 13.0.0

BIG-IP Analytics: 12.1.0 - 13.0.0

BIG-IP APM: 12.1.0 - 13.0.0

BIG-IP ASM: 12.1.0 - 13.0.0

BIG-IP DNS: 12.1.0 - 13.0.0

BIG-IP GTM: 12.1.0 - 13.0.0

BIG-IP Link Controller: 12.1.0 - 13.0.0

BIG-IP PEM: 12.1.0 - 13.0.0

BIG-IP WebSafe: 12.1.0 - 13.0.0

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External links
https://support.f5.com/csp/article/K34514540

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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.