Allele Security Alert
Request Smuggling due to normalization of invalid headers
The Go Authors
Go versions before 1.13.1
Go versions before 1.12.10
Go version 1.13.1
Go version 1.12.10
Proof of concept
Go’s net/http (through net/textproto) used to accept and normalize invalid HTTP/1.1 headers with a space before the colon, in violation of RFC 7230. If a Go server is used behind a reverse proxy that accepts and forwards but doesn’t normalize such invalid headers, the reverse proxy and the server can interpret the headers differently. This can lead to filter bypasses or request smuggling, the latter if requests from separate clients are multiplexed onto the same connection by the proxy.
net/http: invalid headers are normalized, allowing request smuggling #34540
197503: net/textproto: don’t normalize headers with spaces before the colon
Analysis of Two Newly Patched Kubernetes Vulnerabilities
[ANNOUNCE] Security Advisory for CVE-2019-16276
HTTP Desync Attacks: Request Smuggling Reborn
If there is any error in this alert or you wish a comprehensive analysis, let us know.
Last modified: October 17, 2019