Description

In Spring Framework versions 5.3.0 - 5.3.16, 5.2.0 - 5.2.19, and older unsupported versions, it is possible for a user to provide a specially crafted SpEL expression that may cause a denial of service condition.

Affected Spring Products and Versions

• Spring Framework
  • 5.3.0 to 5.3.16
  • 5.2.0 to 5.2.19
  • Older, unsupported versions are also affected

Mitigation

Users of affected versions should apply the following mitigation: 5.3.x users should upgrade to 5.3.17+. 5.2.x users should upgrade to 5.2.20+. No other steps are necessary. Releases that have fixed this issue include:

• Spring Framework
  • 5.3.17+
  • 5.2.20+

Credit

This vulnerability was initially discovered and responsibly reported by 4ra1n.

References

• https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:L
• https://cwe.mitre.org/data/definitions/770.html

History

• 2022-03-28: Initial vulnerability report published.
• 2022-04-05: Clarification that fix was backported to Spring Framework 5.2.20.