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AUSCERT External Security Bulletin Redistribution
Ruby - Potential HTTP Request Smuggling Vulnerability in
5 October 2020
AusCERT Security Bulletin Summary
Operating System: UNIX variants (UNIX, Linux, OSX)
Impact/Access: Unauthorised Access -- Existing Account
Reduced Security -- Existing Account
CVE Names: CVE-2020-25613
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CVE-2020-25613: Potential HTTP Request Smuggling Vulnerability in WEBrick
Posted by mame on 29 Sep 2020
A potential HTTP request smuggling vulnerability in WEBrick was reported. This
vulnerability has been assigned the CVE idenfitifer CVE-2020-25613. We strongly
recommend upgrading the webrick gem.
WEBrick was too tolerant against an invalid Transfer-Encoding header. This may
lead to inconsistent interpretation between WEBrick and some HTTP proxy
servers, which may allow the attacker to "smuggle" a request. See CWE-444 in
Please update the webrick gem to version 1.6.1 or later. You can use gem update
webrick to update it. If you are using bundler, please add gem "webrick", ">=
1.6.1" to your Gemfile.
o webrick gem 1.6.0 or prior
o bundled versions of webrick in ruby 2.7.1 or prior
o bundled versions of webrick in ruby 2.6.6 or prior
o bundled versions of webrick in ruby 2.5.8 or prior
Thanks to piao for discovering this issue.
o Originally published at 2020-09-29 06:30:00 (UTC)
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