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* Atlassian fixes Confluence zero-day widely exploited in attacks
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ATLASSIAN FIXES CONFLUENCE ZERO-DAY WIDELY EXPLOITED IN ATTACKS
By
SERGIU GATLAN
* June 3, 2022
* 01:47 PM
* 0
Atlassian has released security updates to address a critical zero-day
vulnerability in Confluence Server and Data Center actively exploited in the
wild to backdoor Internet-exposed servers.
The zero-day (CVE-2022-26134) affects all supported versions of Confluence
Server and Data Center and allows unauthenticated attackers to gain remote code
execution on unpatched servers.
Since it was disclosed as an actively exploited bug, the Cybersecurity and
Infrastructure Security Agency (CISA) has also added it to its 'Known Exploited
Vulnerabilities Catalog' requiring federal agencies to block all internet
traffic to Confluence servers on their networks.
PLAY Top Articles Video Settings Full Screen About Connatix V165536 Read More
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The company has now released patches and advises all customers to upgrade their
appliances to versions 7.4.17, 7.13.7, 7.14.3, 7.15.2, 7.16.4, 7.17.4, and
7.18.1, which contain a fix for this flaw.
"We strongly recommend upgrading to a fixed version of Confluence as there are
several other security fixes included in the fixed versions of Confluence,"
Atlassian said.
Admins who cannot immediately upgrade their Confluence installs can also use a
temporary workaround to mitigate the CVE-2022-26134 security bug by updating
some JAR files on their Confluence servers by following the detailed
instructions available here.
WIDELY EXPLOITED IN ONGOING ATTACKS
The security vulnerability was discovered by cybersecurity firm Volexity over
the Memorial Day weekend during an incident response.
While analyzing the incident, Volexity discovered that the zero-day was used to
install a BEHINDER JSP web shell allowing the threat actors to execute commands
on the compromised server remotely.
They also deployed a China Chopper web shell and a simple file upload tool as
backups to maintain access to the hacked server.
Volexity threat analysts added that they believe multiple threat actors from
China are using CVE-2022-26134 exploits to hack into Internet-exposed and
unpatched Confluence servers.
The company also released a list of IP addresses used in the attacks and
some Yara rules to identify web shell activity on potentially breached
Confluence servers.
"The targeted industries/verticals are quite widespread. This is a free-for-all
where the exploitation seems coordinated," Volexity President Steven
Adair revealed today.
"It is clear that multiple threat groups and individual actors have the exploit
and have been using it in different ways.
"Some are quite sloppy and others are a bit more stealth. Loading class files
into memory and writing JSP shells are the most popular we have seen so far."
A similar Atlassian Confluence remote code execution vulnerability was exploited
in the wild in September 2021 to install cryptomining malware after a PoC
exploit was publicly shared online.
RELATED ARTICLES:
Critical Atlassian Confluence zero-day actively used in attacks
Exploit released for Atlassian Confluence RCE bug, patch now
Linux botnets now exploit critical Atlassian Confluence bug
Apple emergency update fixes zero-day used to hack Macs, Watches
Atlassian finally explains the cause of ongoing cloud outage
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SERGIU GATLAN
Sergiu Gatlan is a reporter who covered cybersecurity, technology, Apple,
Google, and a few other topics at Softpedia for more than a decade. Email or
Twitter DMs for tips.
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