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CVE-2021-21342— A Server-Side Forgery Request can be activated unmarshalling with XStream to access data streams from an arbitrary URL referencing a resource in an intranet or the local host

Quick assessment

Affected
x-stream xstream
Exploitation
High exploitation probability; assess promptly
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

XStream是XStream团队的一个轻量级的、简单易用的开源Java类库，它主要用于将对象序列化成XML（JSON）或反序列化为对象。 XStream 存在代码问题漏洞，攻击者可利用该漏洞可以操纵已处理的输入流并替换或注入对象，从而导致服务器端伪造请求。

CVSS 5.3 · Medium EPSS 49.99% · P99

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
x-stream xstream < 1.4.16 affected
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I. Basic Information for CVE-2021-21342

Vulnerability Information
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Vulnerability Title
A Server-Side Forgery Request can be activated unmarshalling with XStream to access data streams from an arbitrary URL referencing a resource in an intranet or the local host
Source: CVE Program / CVE List V5
Vulnerability Description
XStream is a Java library to serialize objects to XML and back again. In XStream before version 1.4.16, there is a vulnerability where the processed stream at unmarshalling time contains type information to recreate the formerly written objects. XStream creates therefore new instances based on these type information. An attacker can manipulate the processed input stream and replace or inject objects, that result in a server-side forgery request. No user is affected, who followed the recommendation to setup XStream's security framework with a whitelist limited to the minimal required types. If you rely on XStream's default blacklist of the Security Framework, you will have to use at least version 1.4.16.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:N
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
XStream 代码问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
XStream是XStream团队的一个轻量级的、简单易用的开源Java类库，它主要用于将对象序列化成XML（JSON）或反序列化为对象。 XStream 存在代码问题漏洞，攻击者可利用该漏洞可以操纵已处理的输入流并替换或注入对象，从而导致服务器端伪造请求。
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
x-stream xstream < 1.4.16 -

II. Public POCs for CVE-2021-21342

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III. Intelligence Information for CVE-2021-21342

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Vendor Advisories for CVE-2021-21342 (6)

Mailing List Discussions for CVE-2021-21342 (6)

Security Blog Posts for CVE-2021-21342 (2)

Same Patch Batch · x-stream · 2021-03-22 · 11 CVEs total

CVE-2021-21341 7.5 HIGH XStream can cause a Denial of Service
CVE-2021-21346 6.1 MEDIUM XStream is vulnerable to an Arbitrary Code Execution attack
CVE-2021-21347 6.1 MEDIUM XStream is vulnerable to an Arbitrary Code Execution attack
CVE-2021-21349 6.1 MEDIUM A Server-Side Forgery Request can be activated unmarshalling with XStream to access data s
CVE-2021-21345 5.8 MEDIUM XStream is vulnerable to a Remote Command Execution attack
CVE-2021-21351 5.4 MEDIUM XStream is vulnerable to an Arbitrary Code Execution attack
CVE-2021-21343 5.3 MEDIUM XStream is vulnerable to an Arbitrary File Deletion on the local host when unmarshalling a
CVE-2021-21344 5.3 MEDIUM XStream is vulnerable to an Arbitrary Code Execution attack
CVE-2021-21348 5.3 MEDIUM XStream is vulnerable to an attack using Regular Expression for a Denial of Service (ReDos
CVE-2021-21350 5.3 MEDIUM XStream is vulnerable to an Arbitrary Code Execution attack

IV. Related Vulnerabilities

Same product: xstream
Same vendor: x-stream
Same weakness: CWE-502

V. Comments for CVE-2021-21342

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