REDHAT-BUG-1221641
First published: Thu May 14 2015(Updated: )
The following flaw was found in CUPS: Cupsd uses reference-counted strings with global scope. When parsing a print job request, cupsd over-decrements the reference count for a string from the request. As a result, an attacker can prematurely free an arbitrary string of global scope. They can use this to dismantle ACLs protecting privileged operations, and upload a replacement configuration file, and subsequently run arbitrary code on a target machine. This bug is exploitable in default configurations, and does not require any special permissions other than the basic ability to print. Acknowledgements: Red Hat would like to thank the CERT/CC for reporting this issue.
| Affected Software | Affected Version | How to fix |
|---|---|---|
| CUPS |
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Reference Links
- https://www.cups.org/str.php?L4609
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1229979
- https://rhn.redhat.com/errata/RHSA-2015-1123.html
- http://googleprojectzero.blogspot.com/2015/06/owning-internet-printing-case-study-in.html
- https://access.redhat.com/security/cve/CVE-2015-1158
- https://www.kb.cert.org/vuls/id/810572
- https://access.redhat.com/security/cve/CVE-2015-1159
- https://access.redhat.com/support/policy/updates/errata/
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1221641#c12
- https://securityblog.redhat.com/2013/02/13/how-red-hat-uses-cvssv2-scoring-to-assist-in-rating-flaws/
- http://cups.org/documentation.php/doc-1.3/policies.html
- https://bugzilla.redhat.com/show_bug.cgi?id=1221641
Frequently Asked Questions
What is the severity of REDHAT-BUG-1221641?
The severity of REDHAT-BUG-1221641 is classified as high due to its potential to lead to arbitrary code execution.
How do I fix REDHAT-BUG-1221641?
To fix REDHAT-BUG-1221641, you should update your CUPS installation to the latest version that addresses this vulnerability.
What versions of CUPS are affected by REDHAT-BUG-1221641?
REDHAT-BUG-1221641 affects specific versions of CUPS that include the flawed implementation of reference-counted strings.
Can REDHAT-BUG-1221641 be exploited remotely?
Yes, REDHAT-BUG-1221641 can be exploited remotely if an attacker can send a crafted print job request.
What impact does REDHAT-BUG-1221641 have on system security?
The impact of REDHAT-BUG-1221641 on system security includes the possibility of an attacker executing arbitrary code on the affected system.
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