Apache’s Critical CVE: The Facts Without the FUD

The facts, without the FUD

The CVE was reported first by Anthropic researchers using code analysis tools, then later by Google security researchers. It affects recent Apache HTTP Servers, which are widely used to serve websites, files, and content. The vulnerability doesn’t necessarily mean that instances of Apache Server are exploitable; attackers may need to chain multiple vulnerabilities together to accomplish their goals.

At time of disclosure, there were no known proof-of-concepts or exploits that take advantage of the vulnerability. Early reports indicate that the vulnerability may be mitigated by default configurations of operating systems that typically run Apache HTTP Server.

However, reports from Red Hat suggest that the vulnerability can be exploited to achieve unauthenticated remote code execution. At time of writing, it’s difficult to say for sure how far the damage could reach.

How can this affect organizations?

Due to the nature of Apache HTTP Server as infrastructure, the attacker can leverage an exploit a number of different ways. If a functional exploit is eventually discovered, or this vulnerability is chained with others to produce an exploit, here are a couple examples of how they could use it:

• Initial Access: take over a server on the perimeter and gain a foothold to probe internal networks or intercept credentials that might be useful elsewhere.
• Supply Chain attack: if the affected server is used to distribute software or as a source for auto-updates of software, an attacker with control can swap in their own executables. Users and systems that rely on the server for content distribution will receive the malware without realizing it.

How can this be used for ransomware?

If this vulnerability is exploited, just by itself a vector for initial access and potential access to credentials makes this a first step on nearly every ransomware attack chain.

For Ransomware-as-a-Service, or any sophisticated ransomware deployment, the ability to poison content that users might download is a direct path to deploying malware. With Apache HTTP Server, users might not even knowingly interact with it. This makes it a potential final step on a ransomware attack chain, and used to directly distribute encryptors to endpoints that have access to files and file servers that are required for operational continuity.

It’s not totally clear yet how significant this threat is, just like a recent PHP2Shell vulnerability, but Quell’s design is to contain damage no matter what steps the ransomware follows on the attack chain.

How does Quell help?

QuellSecure’s Active Containment® is a right-of-boom containment layer, so it is somewhat indifferent to this vulnerability as a vector for initial access or mass deployment of malware to endpoints. An encryptor that is deployed using this CVE would appear to Quell as just the same as any other encryptor; the damage to files would be contained.