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AUSCERT External Security Bulletin Redistribution
CVE-2017-10784: Escape sequence injection vulnerability in
the Basic authentication of WEBrick
18 September 2017
AusCERT Security Bulletin Summary
Product: Ruby WEBrick
Operating System: Windows
UNIX variants (UNIX, Linux, OSX)
Impact/Access: Execute Arbitrary Code/Commands -- Remote with User Interaction
CVE Names: CVE-2017-10784
Revision History: September 18 2017: Corrected product name.
September 15 2017: Initial Release
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CVE-2017-10784: Escape sequence injection vulnerability in the Basic
authentication of WEBrick
Posted by usa on 14 Sep 2017
There is an escape sequence injection vulnerability in the Basic
authentication of WEBrick bundled by Ruby. This vulnerability has been
assigned the CVE identifier CVE-2017-10784.
When using the Basic authentication of WEBrick, clients can pass an arbitrary
string as the user name. WEBrick outputs the passed user name intact to its
log, then an attacker can inject malicious escape sequences to the log and
dangerous control characters may be executed on a victims terminal emulator.
This vulnerability is similar to a vulnerability already fixed, but it had not
been fixed in the Basic authentication.
All users running an affected release should upgrade immediately.
Ruby 2.2 series: 2.2.7 and earlier
Ruby 2.3 series: 2.3.4 and earlier
Ruby 2.4 series: 2.4.1 and earlier
prior to trunk revision 58453
Thanks to Yusuke Endoh email@example.com for reporting this issue.
Originally published at 2017-09-14 12:00:00 (UTC)
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