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The Log4j vulnerability, identified as CVE-2021-44228 and also known as Log4Shell, is a severe cybersecurity threat that has been affecting a wide array of services and products, including Apple's iCloud, Twitter, Microsoft's Minecraft, Amazon, and numerous enterprise systems.
Discovered by researchers at LunaSec, this flaw in the ubiquitous Log4j Java library—which is extensively used in Java-based enterprise applications and servers—allows attackers to execute arbitrary code and gain unauthorized access to computer systems.
The vulnerability operates by allowing attackers who can manipulate log messages or their parameters to execute code from LDAP servers when message lookup substitution is enabled.
This has raised alarms because the exploit has likely been utilized to compromise certain systems, and now that it's public, there is an urgent need for patches.
The issue has been mitigated in Log4j version 2.
15.
0 and later, where the problematic behavior is disabled by default.
Many services, including gaming platforms like Steam and Apple's iCloud, have been reported as vulnerable.
Microsoft's Minecraft has responded by advising users on updating the game to avoid the vulnerability.
Similarly, other open-source projects are releasing patches to address the issue.
On GitHub, a list of affected companies includes