Atlassian Confluence flaw under active attack

Victoria D. Doty

A important vulnerability in Atlassian’s Confluence Server software program is now underneath lively assault.

Disclosed very last week by Atlassian, CVE-2021-26084 is remote code execution bug that is regarded as a important stability hazard by the vendor. The flaw, which was rated a nine.eight on the CVSS scale, is owing to an injection bug in the open up resource Item-Graph Navigation Language (OGNL) uncovered and reported by stability researcher Benny Jacob by way of Atlassian’s bug bounty application.

Troy Mursch, chief study officer with menace intelligence vendor Poor Packets, verified to SearchSecurity that CVE-2021-26084 was now being focused in the wild.

“I can ensure Poor Packets honeypots have detected mass scanning and exploit exercise focusing on the Atlassian Confluence RCE vulnerability CVE-2021-26084 from hosts in Russia, Hong Kong, Brazil, Poland, and Romania,” Mursch claimed. “A number of proof-of-ideas (PoCs) have been posted publicly demonstrating how to exploit this vulnerability.”

Directors are being urged to update any on-premise versions of Atlassian’s Confluence Server collaboration software program as hackers have now descended on the important stability flaw. Cloud-hosted versions of Confluence Server are not vulnerable to assault, Atlassian claimed.

According to Atlassian, the bug ordinarily involves the attacker to be logged into the community to exploit, but underneath some instances servers can be remotely exploited with no any authentication.

In a demonstration of the flaw, researcher Severe Jaiswal confirmed how the bug could be exploited to acquire remote code execution.

“From our being familiar with & debugging we came to this summary: Attributes of #tag components in Velocity template are evaluated as OGNL Expressions to change the template into HTML,” Jaiswal wrote.

For directors, this usually means that having the flaw patched as before long as achievable is critical. In some conditions, Mursch claimed, it might by now be too late. When Poor Packets would not have an estimate on the range of vulnerable servers in the wild, the sheer volume of exercise against the flaw really should make the update a priority.

“Companies working with the on-premises edition of Confluence need to have to straight away use the update furnished by Atlassian and look at their servers for any indicators of compromise,” claimed Mursch.

“Supplied the degree of scanning of exploit exercise we have detected so considerably right now, any unpatched servers are at rapid hazard of compromise.”

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