8.1 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
6.8 Medium
CVSS2
Access Vector
NETWORK
Access Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:N/AC:M/Au:N/C:P/I:P/A:P
0.975 High
EPSS
Percentile
100.0%
Apache Struts 2 framework, versions 2.5 to 2.5.12, with REST plugin insecurely deserializes untrusted XML data. A remote, unauthenticated attacker can leverage this vulnerability to execute arbitrary code in the context of the Struts application.
CWE-502: Deserialization of Untrusted Data - CVE-2017-9805
In Apache Struts 2 framework, versions 2.5 to 2.5.12, the REST plugin uses XStreamHandler
with an instance of XStream to deserialize XML data. Because there is no type filtering, a remote, unauthenticated attacker may send a specially crafted XML payload to execute arbitrary code in the context of the Struts application.
Refer to the researcherβs blog post for more information about this vulnerability. A Metasploit module with exploit code is publicly available.
A remote, unauthenticated attacker may send a specially crafted XML payload to execute arbitrary code on vulnerable servers in the context of the Struts application.
Apply an update
The vendor has released version 2.5.13 to address this vulnerability. No workaround is possible according to the vendor, so patching is strongly recommended.
Remove or limit the REST plugin
If it is not used, consider removing the REST plugin. Per the vendor, it is also possible to limit its functionality to normal server pages or JSON with the following configuration change in struts.xml
:
<constant name="struts.action.extension" value="xhtml,,json" />
112992
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Updated: September 06, 2017
Affected
We have not received a statement from the vendor.
We are not aware of further vendor information regarding this vulnerability.
Group | Score | Vector |
---|---|---|
Base | 10 | AV:N/AC:L/Au:N/C:C/I:C/A:C |
Temporal | 8.3 | E:F/RL:OF/RC:C |
Environmental | 8.3 | CDP:ND/TD:H/CR:ND/IR:ND/AR:ND |
Man Yue Mo of lgtm is credited with reporting this vulnerability to the vendor.
This document was written by Joel Land.
CVE IDs: | CVE-2017-9805 |
---|---|
Date Public: | 2017-09-05 Date First Published: |
8.1 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
6.8 Medium
CVSS2
Access Vector
NETWORK
Access Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:N/AC:M/Au:N/C:P/I:P/A:P
0.975 High
EPSS
Percentile
100.0%