Bug 642896 (CVE-2010-3904)
| Summary: | CVE-2010-3904 kernel: RDS sockets local privilege escalation | ||
|---|---|---|---|
| Product: | [Other] Security Response | Reporter: | Eugene Teo (Security Response) <eteo> |
| Component: | vulnerability | Assignee: | Red Hat Product Security <security-response-team> |
| Status: | CLOSED ERRATA | QA Contact: | |
| Severity: | high | Docs Contact: | |
| Priority: | high | ||
| Version: | unspecified | CC: | arozansk, bmourelo, collura, csieh, dfeng, dhoward, fhrbata, kbsingh, kzhang, matthew.ife, mjc, nixon, peterm, plyons, pmatouse, redhat, rkhan, security-response-team |
| 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: | 2021-10-19 09:15:28 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: | 642897, 642898, 642899, 642900, 645252, 645305 | ||
| Bug Blocks: | |||
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Description
Eugene Teo (Security Response)
2010-10-14 04:09:01 UTC
Statement: The Linux kernel as shipped with Red Hat Enterprise Linux 3, 4 and Red Hat Enterprise MRG did not include support for the RDS Protocol, and therefore are not affected by this issue. Updates for Red Hat Enterprise Linux 5 and 6 are available to address this flaw. Mitigation: For users that do not run applications that use RDS, you can prevent the rds module from being loaded by adding the following entry to the end of the /etc/modprobe.d/blacklist file: blacklist rds This way, the rds module cannot be loaded accidentally, which may occur if an application that requires RDS is started. A reboot is not necessary for this change to take effect but do make sure the module is not loaded in the first place. You can verify that by running: lsmod | grep rds You may also consider removing the CAP_SYS_MODULE capability from the current global capability set to prevent kernel modules from being loaded or unloaded. The CAP_SYS_MODULE has a capability number of 16 (see linux/capability.h). The default value has all the bits set. To remove this capability, you have to clear the 16th bit of the default 32-bit value, e.g. 0xffffff ^ (1 << 16): echo 0xFFFEFFFF > /proc/sys/kernel/cap-bound Public advisory: http://www.vsecurity.com/resources/advisory/20101019-1/ Upstream commit: http://git.kernel.org/linus/799c10559d60f159ab2232203f222f18fa3c4a5f Excuse me, isn't this trivially exploitable on RHEL 5? Doesn't that warrant a prompt kernel update? (In reply to comment #10) > Excuse me, isn't this trivially exploitable on RHEL 5? > > Doesn't that warrant a prompt kernel update? If you are unable to perform the mitigation steps, please contact Red Hat Support for a hotfix. We are planning to get this addressed in Red Hat Enterprise Linux 5 soon. Thanks. Noting Fedora tracking bugs created elsewhere: CVE-2010-3904 Affects: Fedora 12/13 [bug #645252] CVE-2010-3904 Affects: Fedora 14 [bug #645305] This does not work on most domains confined by SELinux, including RBAC enabled users such as staff_t and user_t, because it relies on having access to the system map / kallsyms which is a restricted file and/or "create" access on sockets which is typically not supplied in most confinements. This issue has been addressed in following products: Red Hat Enterprise Linux 5 Via RHSA-2010:0792 https://rhn.redhat.com/errata/RHSA-2010-0792.html This issue has been addressed in following products: Red Hat Enterprise Linux 6 Via RHSA-2010:0842 https://rhn.redhat.com/errata/RHSA-2010-0842.html This issue has been addressed in following products: Red Hat Enterprise Linux 6 Via RHSA-2010:0842 https://rhn.redhat.com/errata/RHSA-2010-0842.html |