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AUSCERT External Security Bulletin Redistribution
ESB-2019.0281
K18263026: The BIG-IP HTTP parser can incorrectly parse a tab character
31 January 2019
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AusCERT Security Bulletin Summary
---------------------------------
Product: F5 BIG-IP ASM
F5 BIG-IP LTM
Publisher: F5 Networks
Operating System: Network Appliance
Impact/Access: Provide Misleading Information -- Remote/Unauthenticated
Resolution: Patch/Upgrade
Original Bulletin:
https://support.f5.com/csp/article/K18263026
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K18263026: The BIG-IP HTTP parser can incorrectly parse a tab character
Security Advisory
Original Publication Date: Jan 30, 2019
Applies to (see versions):
o Product: BIG-IP, BIG-IP ASM, BIG-IP LTM
o 14.0.0, 13.1.1, 13.1.0, 13.0.1, 13.0.0, 12.1.3, 12.1.2, 12.1.1, 12.1.0,
12.0.0
Security Advisory Description
When scanning a URI, the HTTP parser on the BIG-IP system may periodically
treat a tab character as white space, which causes incorrect URI parsing. For
example, the BIG-IP system receives the following GET string in an HTTP
request:
GET \t/admin/ HTTP/1.0\r\n\r\n
Because URI parsing begins following the space after the method, in this
example the tab character is treated as ending the URI and the result is a URI
of zero length.
This issue occurs when all of the following conditions are met:
o An HTTP profile is configured on the virtual server.
o A tab control character appears in a URI.
Impact
Incorrect parsing occurs for the HTTP::uri iRule command, traffic policies, or
BIG-IP ASM.
Symptoms
As a result of this issue, you may encounter the following symptom:
o Zero length URI or other incorrect URI parsing by the HTTP profile.
Security Advisory Status
F5 Product Development has assigned ID 744117 to this issue. F5 has confirmed
that this issue exists in the products listed in the Applies to (see versions)
box, located in the upper-right corner of this article. For information about
releases, point releases, or hotfixes that resolve this issue, refer to the
following table.
+------------------+-----------------+----------------------------------------+
|Type of fix |Fixes introduced |Related articles |
| |in | |
+------------------+-----------------+----------------------------------------+
|Release |14.1.0 |K2200: Most recent versions of F5 |
| |12.1.4 |software |
+------------------+-----------------+----------------------------------------+
|Point release/ |13.1.1.4 |K9502: BIG-IP hotfix and point release |
|hotfix | |matrix |
+------------------+-----------------+----------------------------------------+
Security Advisory Recommended Actions
Workaround
None
Supplemental Information
o K51812227: Understanding Security Advisory versioning
o K41942608: Overview of AskF5 Security Advisory articles
o K4602: Overview of the F5 security vulnerability response policy
o K4918: Overview of the F5 critical issue hotfix policy
o K9502: BIG-IP hotfix and point release matrix
o K167: Downloading software and firmware from F5
o K9970: Subscribing to email notifications regarding F5 products
o K9957: Creating a custom RSS feed to view new and updated documents
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The University of Queensland
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