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CVE-2023-39326

CVE-2023-39326 · Denial of service via chunk extensions in net/http

This page contains facts from public vulnerability sources. Check the original advisory before updating.

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.

CVSS 5.3 · Medium · EPSS 1.2% · Fix available

Published
Updated

Stack: system

Affected products and versions

  • net/http/internal

    Versions
    • ≥ 0, < 1.20.12: Affected (semver)
    • ≥ 1.21.0-0, < 1.21.5: Affected (semver)

    Update to 1.20.12; Update to 1.21.5

  • golang-1.19 Debian:12

    Versions
    • 1.19.10-1
    • 1.19.10-2
    • 1.19.11-1
    • 1.19.12-1
    • 1.19.12-2
    • 1.19.12-2~bpo11+1
    • 1.19.12-2~bpo12+1
    • 1.19.13-1
    • 1.19.13-1~bpo11+1
    • 1.19.13-1~bpo12+1
    • 1.19.8-2
    • 1.19.9-1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • golang-1.20 Ubuntu:20.04:LTS

    Versions
    • 1.20.3-1ubuntu0.1~20.04
    Affected ranges
    • ECOSYSTEM: < 1.20.3-1ubuntu0.1~20.04.1

    Update to 1.20.3-1ubuntu0.1~20.04.1

  • golang-1.21 Ubuntu:20.04:LTS

    Versions
    • 1.21.1-1~ubuntu20.04.1
    Affected ranges
    • ECOSYSTEM: < 1.21.1-1~ubuntu20.04.2

    Update to 1.21.1-1~ubuntu20.04.2

  • golang-1.20 Ubuntu:22.04:LTS

    Versions
    • 1.20.3-1ubuntu0.1~22.04
    Affected ranges
    • ECOSYSTEM: < 1.20.3-1ubuntu0.1~22.04.1

    Update to 1.20.3-1ubuntu0.1~22.04.1

  • golang-1.21 Ubuntu:22.04:LTS

    Versions
    • 1.21.1-1~ubuntu22.04.1
    Affected ranges
    • ECOSYSTEM: < 1.21.1-1~ubuntu22.04.2

    Update to 1.21.1-1~ubuntu22.04.2

Original sources

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