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

Quick assessment

Affected
ratpack ratpack
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Ratpack是一款用于构建可扩展HTTP应用程序的Java库。 Ratpack 1.9.0之前版本存在代码问题漏洞，攻击者可利用该漏洞通过针对Ratpack会话存储的恶意制作的Java反序列化小工具链来实现远程代码执行。

CVSS 9.9 · Critical EPSS 1.99% · P80

Possible ATT&CK Techniques 1 AI

T1068 · Exploitation for Privilege Escalation
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I. Basic Information for CVE-2021-29485

Vulnerability Information
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Vulnerability Title
Remote Code Execution Vulnerability in Session Storage
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
可信数据的反序列化
Source: CVE Program / CVE List V5
Vulnerability Title
Ratpack 代码问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Ratpack是一款用于构建可扩展HTTP应用程序的Java库。 Ratpack 1.9.0之前版本存在代码问题漏洞，攻击者可利用该漏洞通过针对Ratpack会话存储的恶意制作的Java反序列化小工具链来实现远程代码执行。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
ratpack ratpack < 1.9.0 -

II. Public POCs for CVE-2021-29485

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III. Intelligence Information for CVE-2021-29485

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Vendor Advisories for CVE-2021-29485 (1)

Other References for CVE-2021-29485 (1)

Same Patch Batch · ratpack · 2021-06-29 · 4 CVEs total

CVE-2021-29479 7.0 HIGH Cached redirect poisoning via X-Forwarded-Host header
CVE-2021-29481 6.5 MEDIUM Client side sessions should not allow unencrypted storage
CVE-2021-29480 4.4 MEDIUM Default client side session signing key is highly predictable

IV. Related Vulnerabilities

Same product: ratpack
Same vendor: ratpack
Same weakness: CWE-502

V. Comments for CVE-2021-29485

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