CVE-2021-29485

Summary

Ratpack is a toolkit for creating web applications. In versions prior to 1.9.0, a malicious attacker can achieve Remote Code Execution (RCE) via a maliciously crafted Java deserialization gadget chain leveraged against the Ratpack session store. If one's application does not use Ratpack's session mechanism, it is not vulnerable. Ratpack 1.9.0 introduces a strict allow-list mechanism that mitigates this vulnerability when used. Two possible workarounds exist. The simplest mitigation for users of earlier versions is to reduce the likelihood of attackers being able to write to the session data store. Alternatively or additionally, the allow-list mechanism could be manually back ported by providing an alternative implementation of SessionSerializer that uses an allow-list.

Affected Software

VendorProductVersion RangeStatus
ratpackratpack< 1.9.0affected

Weaknesses

  • CWE-502: CWE-502: Deserialization of Untrusted Data

ADP Enrichment

CVE Program Container

Additional References

References