Elasticsearch Remote Code Execution Vulnerability

[ Why it matters ]Priority signals

• Exploited in the wild: on CISA's Known Exploited Vulnerabilities list since 2022-03-25
• EPSS: 89% chance of exploitation in the next 30 days (higher than 100% of CVEs)

[ Description ]Official description

The default configuration in Elasticsearch before 1.2 enables dynamic scripting, which allows remote attackers to execute arbitrary MVEL expressions and Java code via the source parameter to _search. NOTE: this only violates the vendor's intended security policy if the user does not run Elasticsearch in its own independent virtual machine.

CISA: Elasticsearch enables dynamic scripting, which allows remote attackers to execute arbitrary MVEL expressions and Java code.

[ Fixes ]Fixes and patches

CISA required action (US federal deadline 15 Apr 2022): Apply updates per vendor instructions.

No fix or interim patch is linked from our sources yet. Check the vendor references below and limit exposure of affected systems until a fix is available.

[ References ]References

• bouk.co/blog/elasticsearch-rceExploit
• www.exploit-db.com/exploits/33370Exploit
• www.osvdb.org/106949Broken Link
• www.rapid7.com/db/modules/exploit/multi/elasticsearch/script_mvel_rceExploitThird Party Advisory
• www.securityfocus.com/bid/67731Exploit
• www.elastic.co/blog/logstash-1-4-3-releasedVendor Advisory
• www.elastic.co/community/securityVendor Advisory
• www.found.no/foundation/elasticsearch-securityExploit
• www.cisa.gov/known-exploited-vulnerabilities-catalogUS Government Resource