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CVE-2023-34241

CVE-2023-34241 · CUPS vulnerable to use-after-free in cupsdAcceptClient()

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

OpenPrinting CUPS is a standards-based, open source printing system for Linux and other Unix-like operating systems. Starting in version 2.0.0 and prior to version 2.4.6, CUPS logs data of free memory to the logging service AFTER the connection has been closed, when it should have logged the data right before. This is a use-after-free bug that impacts the entire cupsd process. The exact cause of this issue is the function `httpClose(con->http)` being called in `scheduler/client.c`. The problem is that httpClose always, provided its argument is not null, frees the pointer at the end of the call, only for cupsdLogClient to pass the pointer to httpGetHostname. This issue happens in function `cupsdAcceptClient` if LogLevel is warn or higher and in two scenarios: there is a double-lookup for the IP Address (HostNameLookups Double is set in `cupsd.conf`) which fails to resolve, or if CUPS is compiled with TCP wrappers and the connection is refused by rules from `/etc/hosts.allow` and `/etc/hosts.deny`. Version 2.4.6 has a patch for this issue.

CVSS 5.3 · Medium · EPSS 1.4% · Fix available

Published
Updated

Stack: system

Affected products and versions

  • cups

    Versions
    • >= 2.0.0, < 2.4.6: Affected

    No fix published

  • cups Debian:12

    Versions
    • 2.4.2-3
    Affected ranges
    • ECOSYSTEM: < 2.4.2-3+deb12u1

    Update to 2.4.2-3+deb12u1

  • cups Debian:13

    Affected ranges
    • ECOSYSTEM: < 2.4.2-5

    Update to 2.4.2-5

  • cups Debian:14

    Affected ranges
    • ECOSYSTEM: < 2.4.2-5

    Update to 2.4.2-5

  • cups Ubuntu:Pro:16.04:LTS

    Versions
    • 2.1.0-4ubuntu3
    • 2.1.0-5
    • 2.1.0-6
    • 2.1.0-6ubuntu1
    • 2.1.0-7
    • 2.1.2-1
    • 2.1.2-2
    • 2.1.3-1
    • 2.1.3-1build1
    • 2.1.3-3
    • 2.1.3-4
    • 2.1.3-4ubuntu0.2
    • 2.1.3-4ubuntu0.3
    • 2.1.3-4ubuntu0.4
    • 2.1.3-4ubuntu0.5
    • 2.1.3-4ubuntu0.6
    • 2.1.3-4ubuntu0.7
    • 2.1.3-4ubuntu0.8
    • 2.1.3-4ubuntu0.9
    • 2.1.3-4ubuntu0.10
    • 2.1.3-4ubuntu0.11
    • 2.1.3-4ubuntu0.11+esm1
    • 2.1.3-4ubuntu0.11+esm2
    Affected ranges
    • ECOSYSTEM: < 2.1.3-4ubuntu0.11+esm3

    Update to 2.1.3-4ubuntu0.11+esm3

  • cups Ubuntu:Pro:18.04:LTS

    Versions
    • 2.2.4-7ubuntu2
    • 2.2.5-2
    • 2.2.6-2
    • 2.2.6-3
    • 2.2.6-4
    • 2.2.6-5
    • 2.2.7-1ubuntu1
    • 2.2.7-1ubuntu2
    • 2.2.7-1ubuntu2.1
    • 2.2.7-1ubuntu2.2
    • 2.2.7-1ubuntu2.3
    • 2.2.7-1ubuntu2.4
    • 2.2.7-1ubuntu2.5
    • 2.2.7-1ubuntu2.6
    • 2.2.7-1ubuntu2.7
    • 2.2.7-1ubuntu2.8
    • 2.2.7-1ubuntu2.9
    • 2.2.7-1ubuntu2.10
    Affected ranges
    • ECOSYSTEM: < 2.2.7-1ubuntu2.10+esm1

    Update to 2.2.7-1ubuntu2.10+esm1

  • cups Ubuntu:20.04:LTS

    Versions
    • 2.2.12-2ubuntu1
    • 2.3.0-6
    • 2.3.0-7
    • 2.3.0-7ubuntu1
    • 2.3.1-1ubuntu1
    • 2.3.1-2
    • 2.3.1-4
    • 2.3.1-7
    • 2.3.1-9ubuntu1
    • 2.3.1-9ubuntu1.1
    • 2.3.1-9ubuntu1.2
    • 2.3.1-9ubuntu1.3
    Affected ranges
    • ECOSYSTEM: < 2.3.1-9ubuntu1.4

    Update to 2.3.1-9ubuntu1.4

  • cups Ubuntu:22.04:LTS

    Versions
    • 2.3.3op2-7ubuntu2
    • 2.4.1op1-1ubuntu1
    • 2.4.1op1-1ubuntu2
    • 2.4.1op1-1ubuntu3
    • 2.4.1op1-1ubuntu4
    • 2.4.1op1-1ubuntu4.1
    • 2.4.1op1-1ubuntu4.2
    Affected ranges
    • ECOSYSTEM: < 2.4.1op1-1ubuntu4.4

    Update to 2.4.1op1-1ubuntu4.4

Original sources

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