Detections
Analytics

Azure Linux 3.0 Security Update: ruby / rubygem-webrick (CVE-2025-6442)

medium Nessus Plugin ID 241907

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Synopsis

The remote Azure Linux host is missing one or more security updates.

Description

The version of ruby / rubygem-webrick installed on the remote Azure Linux 3.0 host is prior to tested version. It is, therefore, affected by a vulnerability as referenced in the CVE-2025-6442 advisory.

 - Ruby WEBrick read_header HTTP Request Smuggling Vulnerability. This vulnerability allows remote attackers to smuggle arbitrary HTTP requests on affected installations of Ruby WEBrick. This issue is exploitable when the product is deployed behind an HTTP proxy that fulfills specific conditions. The specific flaw exists within the read_headers method. The issue results from the inconsistent parsing of terminators of HTTP headers. An attacker can leverage this vulnerability to smuggle arbitrary HTTP requests. Was ZDI- CAN-21876. (CVE-2025-6442)

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

Solution

Update the affected packages.

See Also

https://nvd.nist.gov/vuln/detail/CVE-2025-6442

Plugin Details

Severity: Medium

ID: 241907

File Name: azure_linux_CVE-2025-6442.nasl

Version: 1.1

Type: local

Published: 7/11/2025

Updated: 7/11/2025

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 5.0

CVSS v2

Risk Factor: Medium

Base Score: 6.1

Temporal Score: 4.5

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

CVSS Score Source: CVE-2025-6442

CVSS v3

Risk Factor: Medium

Base Score: 6.5

Temporal Score: 5.7

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

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

Vulnerability Information

CPE: p-cpe:/a:microsoft:azure_linux:rubygems, p-cpe:/a:microsoft:azure_linux:rubygem-webrick, x-cpe:/o:microsoft:azure_linux, p-cpe:/a:microsoft:azure_linux:rubygems-devel, p-cpe:/a:microsoft:azure_linux:ruby, p-cpe:/a:microsoft:azure_linux:ruby-debuginfo

Required KB Items: Host/local_checks_enabled, Host/AzureLinux/release, Host/AzureLinux/rpm-list, Host/cpu

Exploit Ease: No known exploits are available

Patch Publication Date: 7/8/2025

Vulnerability Publication Date: 6/25/2025

Reference Information

CVE: CVE-2025-6442

IAVA: 2025-A-0449