CVE-2021-29485 Remote Code Execution Vulnerability in Session Storage

2021-06-2918:35:11

CWE-502

GitHub_M

www.cve.org

9.9 High

CVSS3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

CHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

9.9 High

AI Score

Confidence

High

0.002 Low

EPSS

Percentile

61.7%

JSON

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.

CNA Affected

[
  {
    "product": "ratpack",
    "vendor": "ratpack",
    "versions": [
      {
        "status": "affected",
        "version": "< 1.9.0"
      }
    ]
  }
]