Vulnerability identifier: #VU12806

Vulnerability risk: Medium

CVSSv3.1: 6.4 [CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2018-5507

CWE-ID: CWE-404

Exploitation vector: Local network

Exploit availability: No

Vulnerable software:
BIG-IP LTM
Hardware solutions / Security hardware applicances
BIG-IP AFM
Hardware solutions / Security hardware applicances
BIG-IP APM
Hardware solutions / Security hardware applicances
BIG-IP ASM
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 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 an adjacent attacker to cause DoS condition on the target system.

The weakness exists due to incorrect decryption of ciphertext from established SSL sessions with small MTU. An adjacent attacker can cause the service to crash.

Mitigation
Update to versions 11.5.6, 11.6.3, 12.1.3.2, 13.0.1 or 13.1.0.

Vulnerable software versions

BIG-IP LTM: 11.5.1 - 13.0.0

BIG-IP AAM: 11.5.1 - 13.0.0

BIG-IP AFM: 11.5.1 - 13.0.0

BIG-IP APM: 11.5.1 - 13.0.0

BIG-IP ASM: 11.5.1 - 13.0.0

BIG-IP Link Controller: 11.5.1 - 13.0.0

BIG-IP PEM: 11.5.1 - 13.0.0

BIG-IP WebSafe: 11.5.1 - 13.0.0

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External links
http://support.f5.com/csp/article/K52521791

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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 local network (LAN).

Is there known malware, which exploits this vulnerability?

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