#VU71817 NULL pointer dereference in BIG-IP and BIG-IP DNS - CVE-2023-22839

Vulnerability identifier: #VU71817

Vulnerability risk: Medium

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:Green]

CVE-ID: CVE-2023-22839

CWE-ID: CWE-476

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
BIG-IP
Hardware solutions / Firmware
BIG-IP DNS
Hardware solutions / Routers & switches, VoIP, GSM, etc

Vendor: F5 Networks

Description

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

The vulnerability exists due to a NULL pointer dreference error when  a DNS profile with the Rapid Response Mode setting enabled is configured on a virtual server with hardware SYN cookies enabled. A remote attacker can send specially crafted traffic to the device and perform a denial of service (DoS) attack.

Mitigation

Install update from vendor's website.

According to vendor the following models are affected by this vulnerability:

• BIG-IP
  • BIG-IP 5000 series (C109)
    BIG-IP 7000 series (D110)
    BIG-IP 10000 series (D113)
    BIG-IP 12000 series (D111)
• BIG-IP iSeries
  • BIG-IP i5600, i5800 (C119)
    BIG-IP i7600, i7800 (C118)
    BIG-IP i10600, i10800 (C116)
    BIG-IP i11600, i11800 (C123)
    BIG-IP i15600, i15800 (D116)
• F5 rSeries
  • r5000
  • r10000
• F5 VELOS BX110 blade
• VIPRION B2100/2150 blade (A109, A113)
• VIPRION B2250 blade (A112)
• VIPRION B4300 series blade (A108, A110)
• VIPRION B4450 series blade

Vulnerable software versions

BIG-IP: 14.1.0 - 14.1.5.2, 15.1.0 - 15.1.8, 16.1.0 - 16.1.3.2, 17.0.0 - 17.0.0.1

BIG-IP DNS: 14.1.0 - 17.0.0.1

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External links
https://my.f5.com/manage/s/article/K37708118

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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.