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CVE-2021-29481— Client side sessions should not allow unencrypted 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之前版本存在安全漏洞，该漏洞源于客户端会话的默认配置导致未加密但已签名的数据被设置为cookie值。攻击者可利用该漏洞窃取泄露的cookie。

CVSS 6.5 · Medium EPSS 0.46% · P38

Possible ATT&CK Techniques 1 AI

T1530 · Data from Cloud Storage
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I. Basic Information for CVE-2021-29481

Vulnerability Information
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Vulnerability Title
Client side sessions should not allow unencrypted storage
Source: CVE Program / CVE List V5
Vulnerability Description
Ratpack is a toolkit for creating web applications. In versions prior to 1.9.0, the default configuration of client side sessions results in unencrypted, but signed, data being set as cookie values. This means that if something sensitive goes into the session, it could be read by something with access to the cookies. For this to be a vulnerability, some kind of sensitive data would need to be stored in the session and the session cookie would have to leak. For example, the cookies are not configured with httpOnly and an adjacent XSS vulnerability within the site allowed capture of the cookies. As of version 1.9.0, a securely randomly generated signing key is used. As a workaround, one may supply an encryption key, as per the documentation recommendation.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
敏感数据的明文存储
Source: CVE Program / CVE List V5
Vulnerability Title
Ratpack 安全漏洞
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之前版本存在安全漏洞，该漏洞源于客户端会话的默认配置导致未加密但已签名的数据被设置为cookie值。攻击者可利用该漏洞窃取泄露的cookie。
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-2021-29481

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III. Intelligence Information for CVE-2021-29481

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Patches & Fixes for CVE-2021-29481 (1)

Vendor Advisories for CVE-2021-29481 (1)

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

CVE-2021-29485 9.9 CRITICAL Remote Code Execution Vulnerability in Session Storage
CVE-2021-29479 7.0 HIGH Cached redirect poisoning via X-Forwarded-Host header
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-312

V. Comments for CVE-2021-29481

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