Debian dla-4290 : python3-h2 - security update

medium Nessus Plugin ID 260924

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Synopsis

The remote Debian host is missing a security-related update.

Description

The remote Debian 11 host has a package installed that is affected by a vulnerability as referenced in the dla-4290 advisory.

------------------------------------------------------------------------- Debian LTS Advisory DLA-4290-1 [email protected] https://www.debian.org/lts/security/ Daniel Leidert September 02, 2025 https://wiki.debian.org/LTS
-------------------------------------------------------------------------

Package : python-h2 Version : 4.0.0-3+deb11u1 CVE ID : CVE-2025-57804 Debian Bug : 1112348

A vulnerability has been discovered in python-h2, a Python HTTP/2 protocol implementation.

CVE-2025-57804

HTTP/2 request splitting vulnerability allows attackers to perform request smuggling attacks by injecting CRLF characters into headers.
This occurs when servers downgrade HTTP/2 requests to HTTP/1.1 without properly validating header names/values, enabling attackers to manipulate request boundaries and bypass security controls.

For Debian 11 bullseye, this problem has been fixed in version 4.0.0-3+deb11u1.

We recommend that you upgrade your python-h2 packages.

For the detailed security status of python-h2 please refer to its security tracker page at:
https://security-tracker.debian.org/tracker/python-h2

Further information about Debian LTS security advisories, how to apply these updates to your system and frequently asked questions can be found at: https://wiki.debian.org/LTS Attachment:
signature.asc Description: This is a digitally signed message part

Tenable has extracted the preceding description block directly from the Debian security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

Solution

Upgrade the python3-h2 packages.

Plugin Details

Severity: Medium

ID: 260924

File Name: debian_DLA-4290.nasl

Version: 1.1

Type: local

Agent: unix

Family: Debian Local Security Checks

Published: 9/3/2025

Updated: 9/3/2025

Supported Sensors: Frictionless Assessment Agent, Nessus Agent, Agentless Assessment, Continuous Assessment, Nessus

Risk Information

VPR

Risk Factor: Low

Score: 2.9

CVSS v2

Risk Factor: Medium

Base Score: 5

Temporal Score: 3.7

Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:P/A:N

CVSS Score Source: CVE-2025-57804

CVSS v3

Risk Factor: High

Base Score: 7.5

Temporal Score: 6.5

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

CVSS v4

Risk Factor: Medium

Base Score: 6.9

Threat Score: 2.7

Threat Vector: CVSS:4.0/E:U

Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:N/SI:L/SA:N

Vulnerability Information

CPE: cpe:/o:debian:debian_linux:11.0, p-cpe:/a:debian:debian_linux:python3-h2

Required KB Items: Host/local_checks_enabled, Host/Debian/release, Host/Debian/dpkg-l

Exploit Ease: No known exploits are available

Patch Publication Date: 9/2/2025

Vulnerability Publication Date: 8/25/2025

Reference Information

CVE: CVE-2025-57804

Detections

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