The pserver_shutdown function in fence_egenera in cman 2.20080629 and 2.20080801 allows local users to overwrite arbitrary files via a symlink attack on the /tmp/eglog temporary file.
Weakness
The product attempts to access a file based on the filename, but it does not properly prevent that filename from identifying a link or shortcut that resolves to an unintended resource.
Affected Software
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Cman | Redhat | 2.20080629 (including) | 2.20080629 (including) |
| Cman | Redhat | 2.20080801 (including) | 2.20080801 (including) |
| CLuster Suite for RHEL 4 | RedHat | fence-0:1.32.68-5.el4 | * |
| Red Hat Enterprise Linux 5 | RedHat | cman-0:2.0.115-34.el5 | * |
| Redhat-cluster | Ubuntu | intrepid | * |
| Redhat-cluster | Ubuntu | upstream | * |
Potential Mitigations
- Follow the principle of least privilege when assigning access rights to entities in a software system.
- Denying access to a file can prevent an attacker from replacing that file with a link to a sensitive file. Ensure good compartmentalization in the system to provide protected areas that can be trusted.
Related Attack Patterns
- https://cwe.mitre.org/data/definitions/132.html
- https://cwe.mitre.org/data/definitions/17.html
- https://cwe.mitre.org/data/definitions/35.html
- https://cwe.mitre.org/data/definitions/76.html
References
- http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=496410
- http://dev.gentoo.org/~rbu/security/debiantemp/cman
- http://secunia.com/advisories/31887
- http://secunia.com/advisories/32387
- http://secunia.com/advisories/32390
- http://secunia.com/advisories/43362
- http://uvw.ru/report.lenny.txt
- http://www.openwall.com/lists/oss-security/2008/09/18/3
- http://www.openwall.com/lists/oss-security/2008/09/24/2
- http://www.openwall.com/lists/oss-security/2008/10/30/2
- http://www.redhat.com/support/errata/RHSA-2011-0266.html
- http://www.securityfocus.com/bid/30898
- http://www.ubuntu.com/usn/USN-875-1
- http://www.vupen.com/english/advisories/2011/0419
- https://bugs.gentoo.org/show_bug.cgi?id=235770
- https://bugzilla.redhat.com/show_bug.cgi?id=460476
- https://exchange.xforce.ibmcloud.com/vulnerabilities/44845
- https://www.redhat.com/archives/fedora-package-announce/2008-October/msg00666.html
- http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=496410
- http://dev.gentoo.org/~rbu/security/debiantemp/cman
- http://secunia.com/advisories/31887
- http://secunia.com/advisories/32387
- http://secunia.com/advisories/32390
- http://secunia.com/advisories/43362
- http://uvw.ru/report.lenny.txt
- http://www.openwall.com/lists/oss-security/2008/09/18/3
- http://www.openwall.com/lists/oss-security/2008/09/24/2
- http://www.openwall.com/lists/oss-security/2008/10/30/2
- http://www.redhat.com/support/errata/RHSA-2011-0266.html
- http://www.securityfocus.com/bid/30898
- http://www.ubuntu.com/usn/USN-875-1
- http://www.vupen.com/english/advisories/2011/0419
- https://bugs.gentoo.org/show_bug.cgi?id=235770
- https://bugzilla.redhat.com/show_bug.cgi?id=460476
- https://exchange.xforce.ibmcloud.com/vulnerabilities/44845
- https://www.redhat.com/archives/fedora-package-announce/2008-October/msg00666.html