Denial of service in BIG-IP glibc implementation

1) Reachable Assertion

EUVDB-ID: #VU50075

Risk: Medium

CVSSv3.1: 6.9 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:U/RC:C]

CVE-ID: CVE-2021-3326

CWE-ID: CWE-617 - Reachable Assertion

Exploit availability: No

Description

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

The vulnerability exists due to a reachable assertion within the iconv function in the GNU C Library (aka glibc or libc6) when processing invalid input sequences in the ISO-2022-JP-3 encoding. A remote attacker can pass specially crafted data to the application, trigger an assertion failure and crash the affected application.

Mitigation

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

Vulnerable software versions

BIG-IP SSLO: 11.6.1 - 13.1.3.6

BIG-IP PEM: 11.6.1 - 13.1.3.6

BIG-IP Link Controller: 11.6.1 - 13.1.3.6

BIG-IP GTM: 11.6.1 - 13.1.3.6

BIG-IP FPS: 11.6.1 - 13.1.3.6

BIG-IP DNS: 11.6.1 - 13.1.3.6

BIG-IP DDHD: 11.6.1 - 13.1.3.6

BIG-IP APM: 11.6.1 - 13.1.3.6

BIG-IP Analytics: 11.6.1 - 13.1.3.6

BIG-IP AFM: 11.6.1 - 13.1.3.6

BIG-IP Advanced WAF: 11.6.1 - 13.1.3.6

BIG-IP AAM: 11.6.1 - 13.1.3.6

BIG-IP LTM: 11.6.1 - 13.1.3.6

BIG-IP: 11.6.1 - 13.1.3.6

BIG-IP ASM: 11.6.1 - 13.1.3.6

External links

http://support.f5.com/csp/article/K44945790

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.