GHSA-4v7x-pqxf-cx7m

Dashboard / Vulnerabilities / GHSA-4v7x-pqxf-cx7m

GHSA-4v7x-pqxf-cx7m

Summary: net/http, x/net/http2: close connections when receiving too many headers

Details: An attacker may cause an HTTP/2 endpoint to read arbitrary amounts of header data by sending an excessive number of CONTINUATION frames. Maintaining HPACK state requires parsing and processing all HEADERS and CONTINUATION frames on a connection. When a request's headers exceed MaxHeaderBytes, no memory is allocated to store the excess headers, but they are still parsed. This permits an attacker to cause an HTTP/2 endpoint to read arbitrary amounts of header data, all associated with a request which is going to be rejected. These headers can include Huffman-encoded data which is significantly more expensive for the receiver to decode than for an attacker to send. The fix sets a limit on the amount of excess header frames we will process before closing a connection.

References: https://nvd.nist.gov/vuln/detail/CVE-2023-45288, https://go.dev/cl/576155, https://go.dev/issue/65051, https://groups.google.com/g/golang-announce/c/YgW0sx8mN3M, https://lists.fedoraproject.org/archives/list/[email protected]/message/QRYFHIQ6XRKRYBI2F5UESH67BJBQXUPT, https://nowotarski.info/http2-continuation-flood-technical-details, https://pkg.go.dev/vuln/GO-2024-2687, https://security.netapp.com/advisory/ntap-20240419-0009, https://www.kb.cert.org/vuls/id/421644, http://www.openwall.com/lists/oss-security/2024/04/03/16, http://www.openwall.com/lists/oss-security/2024/04/05/4