Detections
Analytics
CVE-2019-18277
high
Description
A flaw was found in HAProxy before 2.0.6. In legacy mode, messages featuring a transfer-encoding header missing the "chunked" value were not being correctly rejected. The impact was limited but if combined with the "http-reuse always" setting, it could be used to help construct an HTTP request smuggling attack against a vulnerable component employing a lenient parser that would ignore the content-length header as soon as it saw a transfer-encoding one (even if not entirely valid according to the specification).
References
https://usn.ubuntu.com/4174-1/
http://lists.opensuse.org/opensuse-security-announce/2019-12/msg00019.html
http://lists.opensuse.org/opensuse-security-announce/2019-12/msg00016.html