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AUSCERT External Security Bulletin Redistribution
ESB-2021.1807
Security Bulletin: WebSphere Application Server Java Batch is vulnerable to
an XML External Entity Injection (XXE) vulnerability (CVE-2021-20492)
26 May 2021
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AusCERT Security Bulletin Summary
---------------------------------
Product: WebSphere Application Server
Publisher: IBM
Operating System: Windows
Mac OS
Solaris
Linux variants
IBM i
HP-UX
AIX
z/OS
Impact/Access: Denial of Service -- Remote/Unauthenticated
Access Confidential Data -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2021-20492
Original Bulletin:
https://www.ibm.com/support/pages/node/6456017
- --------------------------BEGIN INCLUDED TEXT--------------------
WebSphere Application Server Java Batch is vulnerable to an XML External Entity
Injection (XXE) vulnerability (CVE-2021-20492)
Document Information
Document number : 6456017
Modified date : 25 May 2021
Product : WebSphere Application Server
Component : Liberty
Software version : Liberty
Operating system(s): AIX
HP-UX
IBM i
Linux
Solaris
Windows
z/OS
Mac OS
Edition : Liberty
Summary
WebSphere Application Server Java Batch is vulnerable to an XML External Entity
Injection (XXE) vulnerability. This has been addressed.
Vulnerability Details
CVEID: CVE-2021-20492
DESCRIPTION: IBM WebSphere Application Server Java Batch is vulnerable to an
XML External Entity Injection (XXE) attack when processing XML data. A remote
attacker could exploit this vulnerability to expose sensitive information or
consume memory resources.
CVSS Base score: 6.5
CVSS Temporal Score: See: https://exchange.xforce.ibmcloud.com/vulnerabilities/
197793 for the current score.
CVSS Vector: (CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:L)
Affected Products and Versions
+------------------------------------+-------------------+
|Affected Product(s) |Version(s) |
+------------------------------------+-------------------+
|WebSphere Application Server Liberty|17.0.0.3 - 21.0.0.5|
+------------------------------------+-------------------+
|WebSphere Application Server |9.0 |
+------------------------------------+-------------------+
|WebSphere Application Server |8.5 |
+------------------------------------+-------------------+
|WebSphere Application Server |8.0 |
+------------------------------------+-------------------+
Remediation/Fixes
The recommended solution is to apply the interim fix or Fix Pack containing
APAR for each named product as soon as practical.
For WebSphere Application Server Liberty 17.0.0.3 - 21.0.0.5 using the
batchManagement-1.0 feature:
. Upgrade to minimal fix pack levels as required by interim fix and then apply
Interim Fix PH34906
- --OR--
. Apply Liberty Fix Pack 21.0.0.6 or later (targeted availability 2Q2021).
For WebSphere Application Server traditional and WebSphere Application Server
Hypervisor Edition:
For V9.0.0.0 through 9.0.5.7:
. Upgrade to minimal fix pack levels as required by interim fix and then apply
Interim Fix PH34906
- --OR--
. Apply Fix Pack 9.0.5.8 or later (targeted availability 2Q2021).
For V8.5.0.0 through 8.5.5.19:
. Upgrade to minimal fix pack levels as required by interim fix and then apply
Interim Fix PH34906
- --OR--
. Apply Fix Pack 8.5.5.20 or later (targeted availability 3Q2021).
For V8.0.0.0 through 8.0.0.15:
. Upgrade to 8.0.0.15 and then apply Interim Fix PH34906
Additional interim fixes may be available and linked off the interim fix
download page.
WebSphere Application Server V8.0 is no longer in full support; IBM recommends
upgrading to a fixed, supported version/release/platform of the product.
Workarounds and Mitigations
None
Acknowledgement
This vulnerability was reported to IBM by Kylinking
Change History
25 May 2021: Initial Publication
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