Use After Free in Apple macOS
CVE-2023-34241
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.
Vulnerability class: Use-After-Free
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L.
EPSS exploit prediction
EPSS: 0.014 (71.8th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 72nd percentile — 71.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.014 · newest: 0.014 · change: 0.000
Affected products
- Apple macOS
- Openprinting Cups — versions >= 2.0.0, < 2.4.6
- Debian Linux — versions 10.0
- Fedoraproject Fedora — versions 37, 38
Weakness classification (CWE)
Public proof-of-concept exploits
References
- github.com/OpenPrinting/cups/security/advisories/GHSA-qjgh-5hcq-5f25 (Exploit, Patch, Vendor Advisory)
- github.com/OpenPrinting/cups/commit/9809947a959e18409dcf562a3466ef246cb90cb2 (Patch)
- github.com/OpenPrinting/cups/releases/tag/v2.4.6 (Release Notes)
- www.openwall.com/lists/oss-security/2023/06/23/10 (Mailing List, Third Party Advisory)
- www.openwall.com/lists/oss-security/2023/06/26/1 (Mailing List, Third Party Advisory)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (Mailing List, Third Party Advisory)
- lists.debian.org/debian-lts-announce/2023/06/msg00038.html (Mailing List)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (Mailing List)
- support.apple.com/kb/HT213843 (Third Party Advisory)
- support.apple.com/kb/HT213844 (Third Party Advisory)
Frequently asked questions
- What is CVE-2023-34241?
- CVE-2023-34241 is a medium-severity vulnerability in Apple macOS, classified under Use After Free. CVSS score: 5.3/10. Published 2023-06-22.
- How severe is CVE-2023-34241?
- Medium severity. CVSS v3 base score is 5.3 out of 10.
- Is CVE-2023-34241 known to be exploited?
- 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.