A malicious HTTP sender can use chunk extensions to cause a receiver reading from a request or response body to read many more bytes from the network than are in the body. A malicious HTTP client can further exploit this to cause a server to automatically read a large amount of data (up to about 1GiB) when a handler fails to read the entire body of a request. Chunk extensions are a little-used HTTP feature which permit including additional metadata in a request or response body sent using the chunked encoding. The net/http chunked encoding reader discards this metadata. A sender can exploit this by inserting a large metadata segment with each byte transferred. The chunk reader now produces an error if the ratio of real body to encoded bytes grows too small.
History

No history.

cve-icon MITRE

Status: PUBLISHED

Assigner: Go

Published: 2023-12-06T16:27:53.832Z

Updated: 2024-08-02T18:02:06.808Z

Reserved: 2023-07-27T17:05:55.188Z

Link: CVE-2023-39326

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Modified

Published: 2023-12-06T17:15:07.147

Modified: 2024-01-20T04:15:07.890

Link: CVE-2023-39326

cve-icon Redhat

Severity : Moderate

Publid Date: 2023-12-06T00:00:00Z

Links: CVE-2023-39326 - Bugzilla