GNU Bash ShellShock Arbitrary Code Execution
Actively exploited in the wild. Patch or mitigate immediately — don't wait for a maintenance window.
An unauthenticated attacker, remotely over the network, with no user interaction, can fully compromise the system — steal data, tamper with it and take it offline.
GNU Bash through 4.3 processes trailing strings after function definitions in the values of environment variables, which allows remote attackers to execute arbitrary code via a crafted environment, as demonstrated by vectors involving the ForceCommand feature in OpenSSH sshd, the mod_cgi and mod_cgid modules in the Apache HTTP Server, scripts executed by unspecified DHCP clients, and other situations in which setting the environment occurs across a privilege boundary from Bash execution, aka "ShellShock." NOTE: the original fix for this issue was incorrect; CVE-2014-7169 has been assigned to cover the vulnerability that is still present after the incorrect fix.
Techniques marked “observed” are corroborated by threat intelligence; the rest are inferred from the weakness type (CWE) and attack vector.
Corroborated threat activity referencing this CVE — with source and confidence, not inference.
Groups documented using the techniques observed against this CVE — a tradecraft association, not a confirmed attribution. Overlap count shown; click for the MITRE profile.
These techniques were analysed against this CVE's real-world exploitation — the matching entries in the ATT&CK chain above are marked “observed”.
Generated by Wavense from the CVE record — an immediate mitigation and the permanent fix.
Isolate critical services, restrict network access to affected systems, and disable or limit potentially vulnerable services (e.g., CGI scripts, ForceCommand in OpenSSH) where possible. Implement web application firewalls (WAFs) to filter suspicious HTTP requests and monitor logs for unusual Bash process invocations or error messages.
The primary resolution is to patch or upgrade GNU Bash to a fixed version that addresses CVE-2014-6271 and subsequent related vulnerabilities like CVE-2014-7169. Ensure all systems running Bash through 4.3 are updated immediately to prevent exploitation. Apply vendor-specific security updates as soon as they become available.
A remote attacker can achieve arbitrary code execution on vulnerable systems by crafting malicious environment variables. This allows the attacker to fully compromise the host, leading to data exfiltration, system takeover, or further network penetration. The impact is severe across various services like web servers (Apache CGI), SSH, and DHCP clients.
Other CVEs affecting eos
A command injection vulnerability has been reported to affect QTS and QuTS hero. If exploited, this vulnerability allows attackers to execute arbitrary commands in a compromised application. We have already fixed this vulnerability in the following versions: QTS 4.5.2.1566 Build 20210202 and later QTS 4.5.1.1495 Build 20201123 and later QTS 4.3.6.1620 Build 20210322 and later QTS 4.3.4.1632 Build 20210324 and later QTS 4.3.3.1624 Build 20210416 and later QTS 4.2.6 Build 20210327 and later QuTS hero h4.5.1.1491 build 20201119 and later
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