In Undertow 2.x before 2.0.0.Alpha2, 1.4.x before 1.4.17.Final, and 1.3.x before 1.3.31.Final, it was found that the fix for CVE-2017-2666 was incomplete and invalid characters are still allowed in the query string and path parameters. This could be exploited, in conjunction with a proxy that also permitted the invalid characters but with a different interpretation, to inject data into the HTTP response. By manipulating the HTTP response the attacker could poison a web-cache, perform an XSS attack, or obtain sensitive information from requests other than their own.
The product acts as an intermediary HTTP agent (such as a proxy or firewall) in the data flow between two entities such as a client and server, but it does not interpret malformed HTTP requests or responses in ways that are consistent with how the messages will be processed by those entities that are at the ultimate destination.
| Link | Tags |
|---|---|
| https://access.redhat.com/errata/RHSA-2018:1322 | vendor advisory |
| https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2017-7559 | issue tracking vendor advisory |
| https://access.redhat.com/errata/RHSA-2018:0002 | vendor advisory |
| https://access.redhat.com/errata/RHSA-2017:3458 | vendor advisory |
| https://issues.jboss.org/browse/UNDERTOW-1251 | issue tracking vendor advisory |
| https://access.redhat.com/errata/RHSA-2018:0004 | vendor advisory |
| https://access.redhat.com/errata/RHSA-2017:3455 | vendor advisory |
| https://access.redhat.com/errata/RHSA-2017:3456 | vendor advisory |
| https://access.redhat.com/errata/RHSA-2018:0003 | vendor advisory |
| https://access.redhat.com/errata/RHSA-2018:0005 | vendor advisory |
| https://access.redhat.com/errata/RHSA-2017:3454 | vendor advisory |