Use After Free Affecting cups-lpd package, versions <1:2.3.3op2-21.el9
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Test your applications- Snyk ID SNYK-ALMALINUX9-CUPSLPD-6060484
- published 15 Nov 2023
- disclosed 7 Nov 2023
Introduced: 7 Nov 2023
CVE-2023-34241 Open this link in a new tabHow to fix?
Upgrade AlmaLinux:9 cups-lpd to version 1:2.3.3op2-21.el9 or higher.
This issue was patched in ALSA-2023:6596.
NVD Description
Note: Versions mentioned in the description apply only to the upstream cups-lpd package and not the cups-lpd package as distributed by AlmaLinux.
See How to fix? for AlmaLinux:9 relevant fixed versions and status.
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.
References
- https://errata.almalinux.org/9/ALSA-2023-6596.html
- https://errata.almalinux.org/8/ALSA-2023-7165.html
- https://access.redhat.com/security/cve/CVE-2023-34241
- https://access.redhat.com/errata/RHSA-2023:6596
- https://access.redhat.com/errata/RHSA-2023:7165
- http://www.openwall.com/lists/oss-security/2023/06/23/10
- http://www.openwall.com/lists/oss-security/2023/06/26/1
- https://github.com/OpenPrinting/cups/commit/9809947a959e18409dcf562a3466ef246cb90cb2
- https://github.com/OpenPrinting/cups/releases/tag/v2.4.6
- https://github.com/OpenPrinting/cups/security/advisories/GHSA-qjgh-5hcq-5f25
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/TBIYKDS3UG3W4Z7YOHTR2AWFNBRYPNYY/
- https://lists.debian.org/debian-lts-announce/2023/06/msg00038.html
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/7I7DWGYGEMBNLZF5UQBMF3SONR37YUBN/
- https://support.apple.com/kb/HT213843
- https://support.apple.com/kb/HT213844
- https://support.apple.com/kb/HT213845