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AUSCERT External Security Bulletin Redistribution
ESB-2022.4076
Malformed ZIP file crashes Universal Forwarders and Splunk
Enterprise through file monitoring input
17 August 2022
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AusCERT Security Bulletin Summary
---------------------------------
Product: Splunk Enterprise
Universal Forwarder
Publisher: Splunk
Operating System: UNIX variants (UNIX, Linux, OSX)
Windows
Resolution: Patch/Upgrade
CVE Names: CVE-2022-37439
Original Bulletin:
https://www.splunk.com/en_us/product-security/announcements/svd-2022-0803.html
Comment: CVSS (Max): 5.5 CVE-2022-37439 (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H)
CVSS Source: Splunk
Calculator: https://www.first.org/cvss/calculator/3.1#CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
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Splunk / Product Security / SVD-2022-0803
Malformed ZIP file crashes Universal Forwarders and Splunk Enterprise through
file monitoring input
Advisory ID: SVD-2022-0803
Published: 2022-08-16
Last Update: 2022-08-16
CVE ID: CVE-2022-37439
CVSSv3.1 Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CVSSv3.1 Score: 5.5, Medium
Bug ID: SPL-220982
CWE: CWE-409
Security Content: Splunk endpoint dos zip bomb vulnerability UF
Description
In Splunk Enterprise and Universal Forwarder versions in the following table,
indexing a specially crafted ZIP file using the file monitoring input can
result in a crash of the application. Attempts to restart the application would
result in a crash and would require manually removing the malformed file. The
vulnerability does not affect Splunk Enterprise 9.0 or higher.
Solution
For Splunk Enterprise and Universal Forwarder customers, upgrade versions to
8.1.11, 8.2.7.1, or higher.
Product Status
Product Version Component Affected Version Fixed Version
Universal Forwarders 8.1 Monitor Processor 8.1.10 and lower 8.1.11
Universal Forwarders 8.2 Monitor Processor 8.2.0 to 8.2.7 8.2.7.1
Universal Forwarders 9.0 - Not affected -
Splunk Enterprise 8.1 Monitor Processor 8.1.10 and lower 8.1.11
Splunk Enterprise 8.2 Monitor Processor 8.2.0 to 8.2.7 8.2.7.1
Splunk Enterprise 9.0 - Not affected -
Mitigations and Workarounds
None
Detection
Splunk endpoint DOS zip bomb vulnerability UF
This search lets an operator retroactively identify potential Splunk app
crashes resulting from SVD-2022-0803. It is not possible to detect the attack
before a crash using this method. The provided search indicates Universal
Forwarder errors from uploaded binary or compressed ZIP files, which this
attack uses. Consider any results from this search for further research to
determine if a malformed ZIP file caused the crash (noting that the file
extension might have been altered).
Severity
Splunk rates the vulnerability as Medium. The prerequisites require local
privileged access to write to a monitored directory that is not restricted to
the Splunk, system, or root user. Hence, Splunk rates the vulnerability as 5.5
with a CVSSv3.1 vector of CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H .
If your Splunk Enterprise instance monitors only the default directories that
the $SPLUNK_HOME/etc/system/default/inputs.conf configuration file defines,
then the instance is not affected and the vulnerability is informational. In
addition, the vulnerability is informational if the filesystem privileges
required to write to the monitored directories are root, system or the Splunk
user.
Acknowledgments
Tim Ip at Adobe and Collegiate Penetration Testing Competition (CPTC)
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