Threat actors are actively exploiting CVE-2022-1388 RCE in F5 BIG
Vulnerabilities mentionedAll →
| CVE | Vulnerability | CVSS | EPSS | Flags | Affected | Exposure | Published |
|---|---|---|---|---|---|---|---|
| CVE-2022-1388 | Unauthenticated RCE in F5 BIG-IP via Missing Authentication F5 BIG-IP contains a critical missing-authentication flaw (CWE-306) in its iControl REST control plane: an unauthenticated attacker with network reachability to the management interface, or to self IPs exposing the REST service on TCP 443, can bypass authentication completely. By sending specially crafted HTTP requests, the attacker gains the ability to execute arbitrary code, create or delete files, and disable services, effectively achieving full takeover of the load balancer or security appliance and the traffic it handles. All F5 BIG-IP deployments running unpatched software are affected; the provided data does not enumerate exact version ranges, which are listed in F5's May 2022 security advisory. The flaw was added to CISA's KEV catalog on 2022-05-10 with known ransomware use, and EPSS assigns a 100% probability of exploitation within 30 days (100th percentile), indicating active in-the-wild exploitation. No public proof-of-concept is catalogued in the provided data, but the KEV listing and known ransomware use confirm real-world attacks. Do: Upgrade affected F5 BIG-IP systems to the fixed releases listed in F5's May 2022 security advisory (K23605340) immediately, prioritizing appliances whose management interface or self IPs on TCP 443 are reachable from untrusted networks; as an interim mitigation, block untrusted access to the management interface and the iControl REST service. Because this flaw is in CISA's KEV catalog with known ransomware use, also hunt for signs of compromise (unexpected files, disabled services, unknown persistence) on any system that was exposed before patching. | 9.8 | 100% | KEV ransomware PoC ×4 |
| large~10,000 internet-exposed BIG-IP systems (public scans at disclosure counted 8k-10k+), with a far larger installed base behind firewalls |
Indicators of compromiseauto-extracted · verify before use · export allAll →
| Type | Indicator | Context |
|---|---|---|
| ipv4 | 209.127.252.207 | oor para mantener el acceso. Ataques desde: 216.162.206.213 209.127.252.207 Payload escribe en /tmp/f5.sh, ejecuta y elimina. pic.twitt |
| ipv4 | 216.162.206.213 | /css/ como backdoor para mantener el acceso. Ataques desde: 216.162.206.213 209.127.252.207 Payload escribe en /tmp/f5.sh, ejecuta y el |
Full article434 words · extracted from securityaffairs.com · click to collapse
Threat actors are exploiting critical F5 BIG-IP flaw CVE-2022-1388 to deliver malicious code, cybersecurity researchers warn.
Threat actors started massively exploiting the critical remote code execution vulnerability, tracked as CVE-2022-1388, affecting F5 BIG-IP.
Last week security and application delivery solutions provider F5 released its security notification to inform customers that it has released security updates from tens of vulnerabilities in its products.ⓘ
The company addressed a total of 43 vulnerabilities, the most severe one is a critical issue tracked as CVE-2022-1388 (CVSS score of 9.8). An unauthenticated attacker with network access to the BIG-IP system through the management port and/or self IP addresses can exploit the CVE-2022-1388 flaw to execute arbitrary system commands, create or delete files, or disable services.
“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, create or delete files, or disable services. There is no data plane exposure; this is a control plane issue only.” reads the advisory published by the vendor.”
The flaw affects the following versions:
16.1.0 – 16.1.2
15.1.0 – 15.1.5
14.1.0 – 14.1.4
13.1.0 – 13.1.4
12.1.0 – 12.1.6
11.6.1 – 11.6.5
and the vendor addressed it with the release of:
17.0.0
16.1.2.2
15.1.5.1
14.1.4.6
13.1.5
The company provided the following temporary mitigations for customers that cannot install the patched versions:
- Block iControl REST access through the self IP address
- Block iControl REST access through the management interface
- Modify the BIG-IP httpd configuration
Researchers from Positive Technologies and Horizon3 Attack Team developed their own exploit code for CVE-2022-1388 and explained that the issue is trivial to exploit.
The popular researcher Kevin Beaumont confirmed the attack the ongoing attacks, but pointed out that they are not targeting the management interface.
https://twitter.com/GossiTheDog/status/1523223763747483648
The researcher Germán Fernández reported that threat actors are exploiting the flaw to drop PHP webshells to “/tmp/f5.sh” and install them to “/usr/local/www/xui/common/css/.”
— Germán Fernández (@1ZRR4H) May 9, 2022🚨 Estoy viendo la explotación masiva de F5 BIG-IP CVE-2022-1388 (RCE), instalando #Webshell en /usr/local/www/xui/common/css/ como backdoor para mantener el acceso.
Ataques desde:
216.162.206.213
209.127.252.207Payload escribe en /tmp/f5.sh, ejecuta y elimina. pic.twitter.com/W9BlpYTUEU
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Text extracted automatically; images, tables and formatting may be missing. Original: https://securityaffairs.com/131132/hacking/big-ip-cve-2022-1388-exploitation.html