F5 urges to address a critical flaw in BIG
Vulnerabilities mentionedAll →
| CVE | Vulnerability | CVSS | EPSS | Flags | Affected | Exposure | Published |
|---|---|---|---|---|---|---|---|
| CVE-2022-26377 | Inconsistent Interpretation of HTTP Requests ('HTTP Request Smuggling') vulnerability in mod_proxy_ajp of Apache HTTP Server allows an attacker to smuggle reque Inconsistent Interpretation of HTTP Requests ('HTTP Request Smuggling') vulnerability in mod_proxy_ajp of Apache HTTP Server allows an attacker to smuggle requests to the AJP server it forwards requests to. This issue affects Apache HTTP Server Apache HTTP Server 2.4 version 2.4.53 and prior versions. NVD description · AI analysis pending | 7.5 | 21% |
| — | ||
| CVE-2023-46747 | F5 BIG-IP TMUI Authentication Bypass Enables Unauthenticated RCE CVE-2023-46747 is a critical authentication bypass (CVSS 9.8) in the F5 BIG-IP Configuration Utility (TMUI) affecting most BIG-IP modules, including LTM, APM, DNS, AWAF, AFM, ASM, and SSL Orchestrator. By sending undisclosed, specially crafted requests to the TMUI, an attacker with network access to the BIG-IP management port and/or self IP addresses bypasses authentication and can execute arbitrary system commands on the system. No privileges or user interaction are required, and successful exploitation effectively yields full control of the affected BIG-IP deployment. Any organization running vulnerable BIG-IP software is exposed, particularly enterprises, service providers, and government agencies whose management interface or self IPs are reachable. The flaw is being actively exploited: it was added to CISA KEV on 2023-10-31 with known ransomware use, public PoC code exists, and reporting links it to Chinese nation-state actors targeting defense and government networks. Do: Upgrade all affected BIG-IP systems to the fixed releases identified in F5 advisory K13763 (17.1.0.1, 16.1.4, 15.1.9, 14.1.5.5, or 13.1.5.1 depending on the train, or later); the CISA KEV listing makes remediation mandatory for federal agencies. As an interim mitigation, restrict network access to the TMUI management port and self IP addresses and apply F5's documented mitigation guidance. Given active nation-state and ransomware exploitation, also audit appliances for indicators of compromise such as unexpected accounts, scheduled tasks, and configuration changes. | 9.8 | 97% | KEV ransomware PoC ×2 |
| largetens of thousands of internet-exposed BIG-IP systems (10k-100k), with a total enterprise installed base plausibly in the hundreds of thousands |
Full article407 words · extracted from securityaffairs.com · click to collapse
F5 warns customers of a critical vulnerability impacting BIG-IP that could lead to unauthenticated remote code execution.
F5 is warning customers about a critical security vulnerability, tracked as CVE-2023-46747 (CVSS 9.8), that impacts BIG-IP and could result in unauthenticated remote code execution.
The vulnerability resides in the configuration utility component, it was reported by Michael Weber and Thomas Hendrickson of Praetorian on October 4, 2023.
“This vulnerability may allow an unauthenticated attacker with network access to the BIG-IP system through the management port and/or self IP addresses to execute arbitrary system commands. There is no data plane exposure; this is a control plane issue only.” reads the advisory published by F5.
The vulnerability affects the following versions:
| Product | Branch | Versions known to be vulnerable1 | Fixes introduced in | Severity | CVSSv3 score2 | Vulnerable component or feature |
| BIG-IP (all modules) | 17.x | 17.1.0 | 17.1.0.3 + Hotfix-BIGIP-17.1.0.3.0.75.4-ENG3 | Critical | 9.8 | Configuration utility |
| 16.x | 16.1.0 – 16.1.4 | 16.1.4.1 + Hotfix-BIGIP-16.1.4.1.0.50.5-ENG3 | ||||
| 15.x | 15.1.0 – 15.1.10 | 15.1.10.2 + Hotfix-BIGIP-15.1.10.2.0.44.2-ENG3 | ||||
| 14.x | 14.1.0 – 14.1.5 | 14.1.5.6 + Hotfix-BIGIP-14.1.5.6.0.10.6-ENG3 | ||||
| 13.x | 13.1.0 – 13.1.5 | 13.1.5.1 + Hotfix-BIGIP-13.1.5.1.0.20.2-ENG3 | ||||
| BIG-IQ Centralized Management | All | None | Not applicable | Not vulnerable | None | None |
F5 has released a shell script for versions 14.1.0 and later. The company pointed out that the script must not be used on any BIG-IP version prior to 14.1.0 because it will prevent the Configuration utility from starting.
“Until it is possible to install a fixed version, you can use the following sections as temporary mitigations.” continues the advisory. “These mitigations restrict access to the Configuration utility to only trusted networks or devices, thereby limiting the attack surface.
- Block Configuration utility access through self IP addresses
- Block Configuration utility access through the management interface“
“As a result of our research we were able to identify an authentication bypass issue that led to complete compromise of an F5 system with the Traffic Management User Interface (TMUI) exposed. The bypass was assigned CVE-2023-46747, and is closely related to CVE-2022-26377.” reads the analysis published by Praetorian. “While the issue we highlighted in the F5 TMUI portal was a critical risk issue and an unknown vulnerability, you can still take steps to protect yourself. After the two previous RCEs in the TMUI service, the interface itself should not be exposed to the Internet in the first place. “
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