🛡️ CVE-2023-34241
🟡 CVSS 5.3 — Medium ⚠️ Exploit Public CWE-416 NVD
5.3
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

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.

Details

Severity MEDIUM
CVSS Score 5.3
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
CWE CWE-416
Public Exploit ⚠️ Yes
Source NVD
Published 2023-06-22
Updated 2026-06-08
Modified 2024-11-21

Affected Packages

Software From version Fixed in
cups 2.2.0 2.4.6
debian-linux — —
fedora — —
macos 13.0 13.5

References

Mailing List, Third Party Advisory http://www.openwall.com/lists/oss-security/2023/06/26/1
Mailing List, Third Party Advisory http://www.openwall.com/lists/oss-security/2023/06/26/1

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