REDHAT-BUG-605397
First published: Thu Jun 17 2010(Updated: )
Quoting from the upstream bug report <a href="http://cups.org/str.php?L3510">http://cups.org/str.php?L3510</a>: directory that is writable by unprivileged processes. This is a latent privilege escalation vulnerability. It can be exploited only in the presence of other CUPS vulnerabilities. Why this is privilege escalation -------------------------------- This is privilege escalation, because an unprivileged process can trick the CUPS server into overwriting arbitrary files as root. Example: drwxrwxr-x 4 root lp /var/cache/cups -rw-r----- 1 root lp /var/cache/cups/remote.cache This file is opened with cupsFileOpen() which simply opens the file with open(filename, O_WRONLY | O_TRUNC | O_CREAT | O_LARGEFILE | O_BINARY, 0666). If a CUPS "external" program has a vulnerability, an attacker can use the group=lp privileges to replace /var/cache/cups/remote.cache with a symlink to a root-writable file. CUPS will then overwrite that file as root. A similar latent vulnerability exists for the state file /var/cache/cups/job.cache. Why this is a latent vulnerability ---------------------------------- This is a latent vulnerability, because there is no known exploit for CUPS "external" programs that run as user=lp, group=lp. The upstream fix looks more like a preventative fix as there does not seem to be anything exploitable here, so this looks like more a hardening than a response to an actual flaw.
| Affected Software | Affected Version | How to fix |
|---|---|---|
| CUPS |
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Reference Links
- http://cups.org/str.php?L3510
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=605399
- http://admin.fedoraproject.org/updates/cups-1.4.4-1.fc13
- http://admin.fedoraproject.org/updates/cups-1.4.4-1.fc12
- http://admin.fedoraproject.org/updates/cups-1.4.4-1.fc11
- https://access.redhat.com/security/cve/CVE-2010-2431
- http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2010-2431
- http://cups.org/articles.php?L596
- http://admin.fedoraproject.org/updates/cups-1.4.4-4.fc13
- https://rhn.redhat.com/errata/RHSA-2010-0811.html
- https://bugzilla.redhat.com/show_bug.cgi?id=605397
Frequently Asked Questions
What is the severity of REDHAT-BUG-605397?
The severity of REDHAT-BUG-605397 is classified as a latent privilege escalation vulnerability.
How does REDHAT-BUG-605397 occur?
REDHAT-BUG-605397 occurs due to a writable directory that is accessible by unprivileged processes.
Can REDHAT-BUG-605397 be exploited without other vulnerabilities?
No, REDHAT-BUG-605397 can only be exploited in conjunction with other CUPS vulnerabilities.
What software is affected by REDHAT-BUG-605397?
REDHAT-BUG-605397 affects the Apple CUPS software.
What steps should be taken to mitigate REDHAT-BUG-605397?
To mitigate REDHAT-BUG-605397, ensure that directories used by CUPS are not writable by unprivileged users.
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