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CVE-2023-39326

Published: 6 December 2023

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.

Priority

Medium

Cvss 3 Severity Score

5.3

Score breakdown

Status

Package Release Status
golang-1.19
Launchpad, Ubuntu, Debian
bionic Ignored
(end of standard support)
focal Does not exist

jammy Does not exist

lunar Ignored
(end of life, was needs-triage)
mantic Does not exist

trusty Ignored
(end of standard support)
upstream Needs triage

xenial Ignored
(end of standard support)
golang-1.20
Launchpad, Ubuntu, Debian
bionic Ignored
(end of standard support)
focal
Released (1.20.3-1ubuntu0.1~20.04.1)
jammy
Released (1.20.3-1ubuntu0.1~22.04.1)
lunar
Released (1.20.3-1ubuntu0.2)
mantic
Released (1.20.8-1ubuntu0.23.10.1)
trusty Ignored
(end of standard support)
upstream
Released (1.20.12-1)
xenial Ignored
(end of standard support)
golang-1.21
Launchpad, Ubuntu, Debian
bionic Ignored
(end of standard support)
focal
Released (1.21.1-1~ubuntu20.04.2)
jammy
Released (1.21.1-1~ubuntu22.04.2)
lunar
Released (1.21.1-1~ubuntu23.04.2)
mantic
Released (1.21.1-1ubuntu0.23.10.1)
trusty Ignored
(end of standard support)
upstream
Released (1.21.5-1)
xenial Ignored
(end of standard support)

Severity score breakdown

Parameter Value
Base score 5.3
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Scope Unchanged
Confidentiality Low
Integrity impact None
Availability impact None
Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N