Spring4Shell vulnerability likely to affect real-world apps, analyst says

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More answers are emerging in Spring Core about the potential risks associated with the newly announced Remote Code Execution (RCE) vulnerability, known as Spring4Shell – with new evidence pointing to a potential impact on real-world applications.

While researchers have noted that the comparison between Spring4Shell and the critical Log4Shell vulnerability is likely to increase, analysts Colin Covey And Will Dorman On Wednesday, they posted a separate confirmation, indicating that they were able to obtain an exploit for the Spring4Shell vulnerability to work against the sample code provided by Spring.

“If the sample code is sensitive, I suspect there are actually real-world applications that are sensitive to RCE,” Dorm said. Tweet,

However, as of this writing, it is unclear how widespread the vulnerability can be, or which specific applications may be sensitive.

That alone suggests that the risk associated with Spring4Shell is not comparable to that of Log4Shell, which was revealed in December as a high-intensity RCE vulnerability. The vulnerability affected the widely used Apache Log4j logging library and was thought to have affected most organizations.

With Spring4Shell still to be decided, Dorm said on Twitter, “Which real-world apps are sensitive to this issue?”

“Or it mostly affects only custom-built software that uses Spring and meets the list of needs to be sensitive,” he said in one. Tweet,

Spring is a popular framework used in the development of Java web applications.

Weakness details

Researchers from several cybersecurity companies have analyzed and published details on the Spring 4 shell vulnerability, which was released on Tuesday. At the time of writing, patches are not currently available.

Security engineers at Pretorian said Wednesday that vulnerabilities affect the spring core of JDK (Java Development Kit) 9 and above. RCE vulnerability stems from the bypass of CVE-2010-1622, Pretorian engineers said.

Pretorian engineers said they have developed functional exploits for RCE vulnerability. “We have disclosed the full details of our exploits to the Spring Security team, and will stop publishing further information until the patch is in place,” they said in a blog post.

(Significantly, the Spring4Shell vulnerability differs from the Spring Cloud vulnerability that was tracked at CVE-2022-22963 and was, confusingly, announced at about the same time as Spring4Shell.)

The bottom line with Spring4Shell is that while it should not be overlooked, “this vulnerability is not as bad as Log4Shell vulnerability”, cybersecurity firm LunaSec said in a blog post.

All of the attack scenarios with Spring4Shell, LunaSec said, are “more complex and have more downside factors than Log4Shell.”

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