Home/CVE/OpenPrinting CUPS is a standards-based, open source printing system for Linux and other Unix-like operating systems. Sta
CVE

CVE-2023-34241

OpenPrinting CUPS is a standards-based, open source printing system for Linux and other Unix-like operating systems. Sta

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.

MEDIUM · CVSS 5.3 EPSS 0.00055
Schedule remediation
  • Public exploit or PoC is available
  • SSVC automatable: yes - attacks can be scripted at scale
Sigma rules8 YARA rules0
⬡

Weakness Classification

CWE-416Use After Free
▤

Affected Products & Versions

6
openprinting cups>= 2.2.0 and < 2.4.6
fedoraproject fedoraall versions
debian linuxall versions
apple macos< 11.7.9
apple macos>= 12.0.0 and < 12.6.8
apple macos>= 13.0 and < 13.5
⚠

Public Exploits & PoCs

1
pocgithub.com · GHSA-qjgh-5hcq-5f25github.com
◈

Sigma Hunt Rules

8
Exact rules name this CVE ID. Product rules name an affected product in their title. Related rules cover techniques used by actors who exploited this CVE. Showing the most relevant matches; the complete related set is on the full drill-down.
producthighSuspicious Microsoft Office Child Process - MacOS
producthighRemote Access Tool - Renamed MeshAgent Execution - MacOS
producthighBinary Padding - MacOS
productmediumSuspicious Execution via macOS Script Editor
productmediumSystem Information Discovery Via Sysctl - MacOS
productmediumNew File Exclusion Added To Time Machine Via Tmutil - MacOS
▣

Scoring & Timeline

5.3
MEDIUM · CVSS v3.1 · security-advisories@github.com
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD22 Jun 2023 · 11:15 PM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
SSVC triage · cisa-vulnrichment
Exploitation
poc
Automatable
yes
Technical impact
partial
SSVC asks the questions that actually drive patch urgency: is it being exploited, can attacks be automated, and how total is the impact.
⚑

Vendor Advisories

11
suse-csafSUSE-SU-2025:20090-1
suse-csafopenSUSE-SU-2024:13017-1
msrcCVE-2023-34241
suse-csafSUSE-SU-2023:3706-1
usnUSN-6184-2
🔗

References & Sources

10
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
http://www.openwall.com/lists/oss-security/2023/06/23/10Mailing ListThird Party Advisory
http://www.openwall.com/lists/oss-security/2023/06/26/1Mailing ListThird Party Advisory
https://github.com/OpenPrinting/cups/commit/9809947a959e18409dcf562a3466ef246cb90cb2Patch
https://github.com/OpenPrinting/cups/releases/tag/v2.4.6Release Notes
https://lists.debian.org/debian-lts-announce/2023/06/msg00038.htmlMailing List
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/7I7DWGYGEMBNLZF5UQBMF3SONR37YUBN/Mailing List
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