| Summary: | CVE-2008-4192 cman/fence: insecure temporary file usage in the egenera fence agent | ||
|---|---|---|---|
| Product: | [Other] Security Response | Reporter: | Jan Lieskovsky <jlieskov> |
| Component: | vulnerability | Assignee: | Red Hat Product Security <security-response-team> |
| Status: | CLOSED ERRATA | QA Contact: | |
| Severity: | low | Docs Contact: | |
| Priority: | low | ||
| Version: | unspecified | CC: | agk, bressers, bstevens, ccaulfie, fdinitto, kreilly, mbroz, mjc |
| Target Milestone: | --- | Keywords: | Security |
| Target Release: | --- | ||
| Hardware: | All | ||
| OS: | Linux | ||
| Whiteboard: | |||
| Fixed In Version: | Doc Type: | Bug Fix | |
| Doc Text: | Story Points: | --- | |
| Clone Of: | Environment: | ||
| Last Closed: | 2012-05-02 22:38:06 UTC | Type: | --- |
| Regression: | --- | Mount Type: | --- |
| Documentation: | --- | CRM: | |
| Verified Versions: | Category: | --- | |
| oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |
| Cloudforms Team: | --- | Target Upstream Version: | |
| Bug Depends On: | 469338, 519682, 519689 | ||
| Bug Blocks: | |||
This issue also affect Red Hat Cluster Suite for Red Hat Enterprise Linux 4, affected egenera fencing agent is shipped as part of the fence package. Logging to a file in /tmp was added in following commit: http://git.fedorahosted.org/git/cluster.git?p=cluster.git;a=commitdiff;h=db7da413 as part of the fix for bug #251358 / bug #233428. FYI this bug affects also Fedora 9, the all 2.03. stable releases and the 2.99. unstable releases. A bug fix for 2.99 has been checked in a few minutes ago. Updates for 2.03 and Fedora will be produced beginning of next week. Fabio rgmanager-2.03.08-1.fc9, gfs2-utils-2.03.08-1.fc9, cman-2.03.08-1.fc9 has been pushed to the Fedora 9 stable repository. If problems still persist, please make note of it in this bug report. This issue has been addressed in following products: CLuster Suite for RHEL 4 Via RHSA-2011:0266 https://rhn.redhat.com/errata/RHSA-2011-0266.html This was correct in RHEL5 via RHBA-2010:0266. |
The cman package as shipped with Red Hat Enterprise Linux 5 and within Fedora release starting from 9 is prone to the symlink attack. Affected file: /sbin/fence_egenera Relevant part of the code: 296 sub pserver_shutdown 297 { 298 my $rtrn=1; 299 local *egen_log; 300 open(egen_log,">/tmp/eglog"); 301 for (my $trys=0; $trys<20; $trys++) 302 { 303 last if (pserver_status != 0); 304 305 306 my $status = $_; . . . Description: A malicious user could precreate a symlink, pointing to the file /tmp/eglog, Subsequent run of the '/sbin/egenera' command would destroy / truncate the target of this link to zero length. References: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=496374 (part for cman) Affected versions: This issue affects the version of cman package, as shipped with Red Hat Enteprise Linux 5 and those, shipped within the Fedora release starting from 9. The cman package as shipped with Red Hat Enteprise Linux 4 Cluster Suite product and that one, shipped within Fedora release of 8, are not affected by this issue.