7.1 High
CVSS3
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
HIGH
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
6.7 Medium
AI Score
Confidence
High
3.2 Low
CVSS2
Access Vector
LOCAL
Access Complexity
LOW
Authentication
SINGLE
Confidentiality Impact
PARTIAL
Integrity Impact
NONE
Availability Impact
PARTIAL
AV:L/AC:L/Au:S/C:P/I:N/A:P
0.0004 Low
EPSS
Percentile
5.4%
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.
www.openwall.com/lists/oss-security/2023/06/23/10
www.openwall.com/lists/oss-security/2023/06/26/1
github.com/OpenPrinting/cups/commit/9809947a959e18409dcf562a3466ef246cb90cb2
github.com/OpenPrinting/cups/releases/tag/v2.4.6
github.com/OpenPrinting/cups/security/advisories/GHSA-qjgh-5hcq-5f25
lists.debian.org/debian-lts-announce/2023/06/msg00038.html
lists.fedoraproject.org/archives/list/[email protected]/message/7I7DWGYGEMBNLZF5UQBMF3SONR37YUBN/
lists.fedoraproject.org/archives/list/[email protected]/message/TBIYKDS3UG3W4Z7YOHTR2AWFNBRYPNYY/
support.apple.com/kb/HT213843
support.apple.com/kb/HT213844
support.apple.com/kb/HT213845
7.1 High
CVSS3
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
HIGH
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
6.7 Medium
AI Score
Confidence
High
3.2 Low
CVSS2
Access Vector
LOCAL
Access Complexity
LOW
Authentication
SINGLE
Confidentiality Impact
PARTIAL
Integrity Impact
NONE
Availability Impact
PARTIAL
AV:L/AC:L/Au:S/C:P/I:N/A:P
0.0004 Low
EPSS
Percentile
5.4%