Bug 1926768 (CVE-2020-28476) - CVE-2020-28476 python-tornado: Web Cache Poisoning by using a vector called parameter cloaking may lead to Integrity and Availability compromise
Summary: CVE-2020-28476 python-tornado: Web Cache Poisoning by using a vector called p...
Keywords:
Status: CLOSED NOTABUG
Alias: CVE-2020-28476
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 1926769 1926770 1928196
Blocks: 1926772
TreeView+ depends on / blocked
 
Reported: 2021-02-09 12:31 UTC by Marian Rehak
Modified: 2021-06-07 15:07 UTC (History)
17 users (show)

Fixed In Version:
Clone Of:
Environment:
Last Closed: 2021-02-16 13:59:40 UTC
Embargoed:

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Description Marian Rehak 2021-02-09 12:31:48 UTC 
All versions of package tornado are vulnerable to Web Cache Poisoning by using a vector called parameter cloaking. When the attacker can separate query parameters using a semicolon (;), they can cause a difference in the interpretation of the request between the proxy (running with default configuration) and the server. This can result in malicious requests being cached as completely safe ones.

Reference:

https://snyk.io/vuln/SNYK-PYTHON-TORNADO-1017109
Comment 1 Marian Rehak 2021-02-09 12:32:29 UTC 
Created python-tornado tracking bugs for this issue:

Affects: epel-8 [bug 1926770]
Affects: fedora-all [bug 1926769]
Comment 2 Riccardo Schirone 2021-02-12 15:56:32 UTC 
Created python3-tornado tracking bugs for this issue:

Affects: epel-all [bug 1928196]
Comment 3 Riccardo Schirone 2021-02-12 16:05:38 UTC 
External References:

https://snyk.io/vuln/SNYK-PYTHON-TORNADO-1017109
Comment 4 Riccardo Schirone 2021-02-16 13:59:40 UTC 
This CVE was rejected by upstream. See at CVE-2021-23336.
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