Log4j vulnerability
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What is Log4j?
- It is a widely used software logging library for Java software.
- Recently, it was exposed by the Apache foundation for having serious security vulnerabilities.
- An attacker exploiting the vulnerability could potentially execute arbitrary, malicious code on an affected system.
- To rectify this breach, the Apache Foundation released patches for various software projects using vulnerable versions of the Log4j library.
How does Log4j vulnerability work?
How bad is the vulnerability?
- It affects a component of the library meant to allow for the insertion of arbitrary system and Java environment variables within software logs.
- An attacker exploiting the vulnerability could potentially execute arbitrary, malicious code on an affected system.
- The vulnerability presents a large attack surface particularly due to the ubiquitous use of the Log4j library in Java software.
What is a zero-day vulnerability and is log4j one of this kind?
- A 0day (or zero-day vulnerability) refers to a security flaw which has not been publicly disclosed and for which a software patch or remediation technique is not available.
- Considering that attempts at exploiting Log4Shell were observed at least a week prior to it being publicly disclosed, it could be said that it was a 0day vulnerability, however, only for a very brief period.
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