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Bug 1383657
| Summary: | dbus: Format string vulnerability | ||
|---|---|---|---|
| Product: | [Other] Security Response | Reporter: | Andrej Nemec <anemec> |
| Component: | vulnerability | Assignee: | Red Hat Product Security <security-response-team> |
| Status: | CLOSED WONTFIX | QA Contact: | |
| Severity: | medium | Docs Contact: | |
| Priority: | medium | ||
| Version: | unspecified | CC: | amigadave, dkholia, dking, dmoppert, lpoetter, sardella, slawomir, walters |
| Target Milestone: | --- | Keywords: | Security |
| Target Release: | --- | ||
| Hardware: | All | ||
| OS: | Linux | ||
| Whiteboard: | |||
| Fixed In Version: | dbus 1.10.12, dbus 1.11.6, dbus 1.8.22 | Doc Type: | If docs needed, set a value |
| Doc Text: | Story Points: | --- | |
| Clone Of: | Environment: | ||
| Last Closed: | 2016-10-14 19:33:48 UTC | Type: | --- |
| Regression: | --- | Mount Type: | --- |
| Documentation: | --- | CRM: | |
| Verified Versions: | Category: | --- | |
| oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |
| Cloudforms Team: | --- | Target Upstream Version: | |
| Embargoed: | |||
| Bug Depends On: | 1383658 | ||
| Bug Blocks: | |||
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Description
Andrej Nemec
2016-10-11 11:33:23 UTC
Created dbus tracking bugs for this issue: Affects: fedora-all [bug 1383658] Versions prior to 1.4.0 are not affected. Note the "mitigated in" versions mentioned in oss-security post, where the attack is still possible but can only be conducted by root, who can already do much worse. Mitigations for CVE-2015-0245 are also effective in the same way. The simplest mitigation for rhel-7 appears to be altering system.conf as per: https://cgit.freedesktop.org/dbus/dbus/commit/?id=6dbd09fedc396c53b25ea73c6c8a278beca349c7 This flaw reliably causes a crash in dbus. But code execution is prevented by _FORTIFY_SOURCE (inhibiting %n) and the fix for CVE-2012-0864 (arbitrary write using %*N). dbus will be restarted the next time anything tries to communicate with it, so the denial of service is temporary. dbus-1.11.6-1.fc25 has been pushed to the Fedora 25 testing repository. If problems still persist, please make note of it in this bug report. See https://fedoraproject.org/wiki/QA:Updates_Testing for instructions on how to install test updates. You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2016-1dc6be6005 dbus-1.11.6-1.fc25 has been pushed to the Fedora 25 stable repository. If problems still persist, please make note of it in this bug report. Mitigation:
The vulnerable dbus interface is intended only for use by systemd, running as root. To prevent non-root attackers from reaching the interface to exercise this flaw, the following configuration can be added to /etc/dbus/system.bus, inside the <busconfig> tag:
<!-- Only systemd, which runs as root, may report activation failures. -->
<policy user="root">
<allow send_destination="org.freedesktop.DBus"
send_interface="org.freedesktop.systemd1.Activator"/>
</policy>
See https://cgit.freedesktop.org/dbus/dbus/commit/?id=6dbd09fedc396c53b25ea73c6c8a278beca349c7
Statement: Red Hat Product Security has rated this issue as having Moderate security impact. This issue is not currently planned to be addressed in future updates. For additional information, refer to the Issue Severity Classification: https://access.redhat.com/security/updates/classification/. |