CISA adds two F5 BIG-IP flaws to its Known Exploited Vulnerabilities catalog
Vulnerabilities mentionedAll →
| CVE | Vulnerability | CVSS | EPSS | Flags | Affected | Exposure | Published |
|---|---|---|---|---|---|---|---|
| CVE-2023-46747 +1 in the same advisory: …46748 | 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 group max | 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 |
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Pierluigi Paganini
November 01, 2023
US CISA added two vulnerabilities, tracked as CVE-2023-46747 and CVE-2023-46748, in BIG-IP to its Known Exploited Vulnerabilities catalog.
The U.S. Cybersecurity and Infrastructure Security Agency (CISA) added the vulnerabilities CVE-2023-46747 and CVE-2023-46748 in BIG-IP to its Known Exploited Vulnerabilities catalog.
CISA has the two new vulnerabilities to its Known Exploited Vulnerabilities Catalog, based on evidence of active exploitation. The two issues are:
- CVE-2023-46747 F5 BIG-IP Authentication Bypass Vulnerability – F5 BIG-IP Configuration utility contains an authentication bypass using an alternate path or channel vulnerability due to undisclosed requests that may allow an unauthenticated attacker with network access to the BIG-IP system through the management port and/or self IP addresses to execute system commands. This vulnerability can be used in conjunction with CVE-2023-46748.
- CVE-2023-46748 F5 BIG-IP SQL Injection Vulnerability – F5 BIG-IP Configuration utility contains an SQL injection vulnerability that may allow an authenticated attacker with network access through the BIG-IP management port and/or self IP addresses to execute system commands. This vulnerability can be used in conjunction with CVE-2023-46747.
Experts warn that threat actors started exploiting the critical flaw CVE-2023-46747 in F5 BIG-IP installs less than five days after PoC exploit disclosure.
On October 30, F5 updated its original advisory warning that threat actors are actively exploiting the vulnerability. The attackers chain the vulnerability with another flaw in BIG-IP’s configuration utility tracked as CVE-2023-46748 (CVSS score of 8.8).
F5 also released indicators-of-compromise (IoCs) to help defenders to identify potential compromises.
“F5 has observed threat actors using this vulnerability to exploit CVE-2023-46748.” states the advisory. “For indicators of compromise for CVE-2023-46748, please refer to K000137365: BIG-IP Configuration utility authenticated SQL injection vulnerability CVE-2023-46748.”
Praetorian Security updated its blog with additional technical info after the Project Discovery team released the proof of concept on Github.
According to Binding Operational Directive (BOD) 22-01: Reducing the Significant Risk of Known Exploited Vulnerabilities, FCEB agencies have to address the identified vulnerabilities by the due date to protect their networks against attacks exploiting the flaws in the catalog.
Experts recommend also private organizations review the Catalog and address the vulnerabilities in their infrastructure.
CISA orders federal agencies to fix this flaw by November 21, 2023.
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