Debian dla-4553 : gir1.2-polkit-1.0 - security update

medium Nessus Plugin ID 310957

Synopsis

The remote Debian host is missing one or more security-related updates.

Description

The remote Debian 11 host has packages installed that are affected by multiple vulnerabilities as referenced in the dla-4553 advisory.

------------------------------------------------------------------------- Debian LTS Advisory DLA-4553-1 [email protected] https://www.debian.org/lts/security/ Andreas Henriksson April 29, 2026 https://wiki.debian.org/LTS
-------------------------------------------------------------------------

Package : policykit-1 Version : 0.105-31+deb11u2 CVE ID : CVE-2021-4115 CVE-2026-4897 Debian Bug : 1005784 1132234

Multiple vulnerabilities where identified in polkit, a toolkit for defining and handling the policy that allows unprivileged processes to speak to privileged processes.

CVE-2021-4115

Kevin Backhouse of GitHub Security Lab (GHSL) found that there is a file descriptor leak in polkit, which can enable an unprivileged user to cause polkit to crash, due to file descriptor exhaustion.
This could lead to currently ongoing authentication attempts to fail to authenticate resulting in a Denial of Service (DoS).

CVE-2026-4897

Pavel Kohout, Aisle Research found that a local user provide a specially crafted, excessively long input to the `polkit-agent-helper-1` setuid binary via standard input (stdin).
This unbounded input can lead to an out-of-memory (OOM) condition, resulting in a Denial of Service (DoS) for the system.

For Debian 11 bullseye, these problems have been fixed in version 0.105-31+deb11u2.

We recommend that you upgrade your policykit-1 packages.

For the detailed security status of policykit-1 please refer to its security tracker page at:
https://security-tracker.debian.org/tracker/policykit-1

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: PGP signature

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

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

Solution

Upgrade the gir1.2-polkit-1.0 packages.

Plugin Details

Severity: Medium

ID: 310957

File Name: debian_DLA-4553.nasl

Version: 1.1

Type: Local

Agent: unix

Family: Debian Local Security Checks

Published: 4/29/2026

Updated: 4/29/2026

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

Risk Information

VPR

Risk Factor: Medium

Score: 4.4

CVSS v2

Risk Factor: Low

Base Score: 2.1

Temporal Score: 1.6

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

CVSS Score Source: CVE-2021-4115

CVSS v3

Risk Factor: Medium

Base Score: 5.5

Temporal Score: 5

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

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

Vulnerability Information

CPE: p-cpe:/a:debian:debian_linux:libpolkit-gobject-1-0, cpe:/o:debian:debian_linux:11.0, p-cpe:/a:debian:debian_linux:policykit-1, p-cpe:/a:debian:debian_linux:gir1.2-polkit-1.0, p-cpe:/a:debian:debian_linux:libpolkit-agent-1-0, p-cpe:/a:debian:debian_linux:policykit-1-doc, p-cpe:/a:debian:debian_linux:libpolkit-gobject-1-dev, p-cpe:/a:debian:debian_linux:libpolkit-agent-1-dev

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

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 4/29/2026

Vulnerability Publication Date: 2/3/2022

Reference Information

CVE: CVE-2021-4115, CVE-2026-4897

Detections

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