CVE-2023-45288
net/http, x/net/http2: close connections when receiving too many headers
Impact
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.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| go | net/http | < 1.21.9 | 1.21.9 |
| go | golang.org/x/net/http2 | < 0.23.0 | 0.23.0 |
| go | golang.org/x/net | < 0.23.0 | 0.23.0 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- http://www.openwall.com/lists/oss-security/2024/04/03/16
- http://www.openwall.com/lists/oss-security/2024/04/05/4
- 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/package-announce@lists.fedoraproject.org/message/QRYFHIQ6XRKRYBI2F5UESH67BJBQXUPT/
- https://pkg.go.dev/vuln/GO-2024-2687
- https://security.netapp.com/advisory/ntap-20240419-0009/
- https://www.kb.cert.org/vuls/id/421644
- https://github.com/advisories/GHSA-4v7x-pqxf-cx7m
- https://nvd.nist.gov/vuln/detail/CVE-2023-45288
- https://nowotarski.info/http2-continuation-flood-technical-details
- https://security.netapp.com/advisory/ntap-20240419-0009
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/QRYFHIQ6XRKRYBI2F5UESH67BJBQXUPT