Bug 1610659 (CVE-2018-10923)
| Summary: | CVE-2018-10923 glusterfs: I/O to arbitrary devices on storage server | ||
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| Product: | [Other] Security Response | Reporter: | Sam Fowler <sfowler> |
| Component: | vulnerability | Assignee: | Red Hat Product Security <security-response-team> |
| Status: | CLOSED ERRATA | QA Contact: | |
| Severity: | high | Docs Contact: | |
| Priority: | high | ||
| Version: | unspecified | CC: | abhgupta, amukherj, anoopcs, atumball, bmcclain, dbaker, dblechte, dfediuck, eedri, humble.devassy, jechoi, jokerman, jonathansteffan, kkeithle, matthias, mgoldboi, michal.skrivanek, ndevos, public, ramkrsna, rhs-bugs, sankarshan, sbonazzo, security-response-team, sfowler, sherold, sisharma, ssaha, sthangav, trankin, vbellur |
| Target Milestone: | --- | Keywords: | Security |
| Target Release: | --- | ||
| Hardware: | All | ||
| OS: | Linux | ||
| Whiteboard: | |||
| Fixed In Version: | glusterfs-3.12.14, glusterfs-4.1.4 | Doc Type: | If docs needed, set a value |
| Doc Text: |
It was found that the "mknod" call derived from mknod(2) can create files pointing to devices on a glusterfs server node. An authenticated attacker could use this to create an arbitrary device and read data from any device attached to the glusterfs server node.
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Story Points: | --- |
| Clone Of: | Environment: | ||
| Last Closed: | 2019-06-10 10:34:44 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: | 1610966, 1616829, 1625091, 1625092, 1625096, 1625648 | ||
| Bug Blocks: | 1609599 | ||
Acknowledgments: Name: Michael Hanselmann (hansmi.ch) Statement: This issue did not affect Red Hat Enterprise Linux 6 and 7 as the flaw is present in glusterfs-server, which is not shipped there. This flaw affects glusterfs versions included in Red Hat Virtualization 4 Hypervisor. However, in recommended configurations, the vulnerability is only exposed to hypervisor administrators and can not be exploited from virtual machines or other hosts on the network. For Red Hat Virtualization, Product Security has rated this flaw as Moderate. For additional information, refer to the Issue Severity Classification: https://access.redhat.com/security/updates/classification/. Created glusterfs tracking bugs for this issue: Affects: fedora-all [bug 1625091] This issue has been addressed in the following products: Red Hat Gluster Storage 3.4 for RHEL 7 Native Client for RHEL 7 for Red Hat Storage Via RHSA-2018:2607 https://access.redhat.com/errata/RHSA-2018:2607 This issue has been addressed in the following products: Red Hat Gluster Storage 3.4 for RHEL 6 Native Client for RHEL 6 for Red Hat Storage Via RHSA-2018:2608 https://access.redhat.com/errata/RHSA-2018:2608 upstream fix: https://review.gluster.org/21069 Mitigation: To limit exposure of gluster server nodes : 1. gluster server should be on LAN and not reachable from public networks. 2. Use gluster auth.allow and auth.reject. 3. Use TLS certificates to authenticate gluster clients. caveat: This does not protect from attacks by authenticated gluster clients. This issue has been addressed in the following products: Red Hat Virtualization 4 for Red Hat Enterprise Linux 7 Via RHSA-2018:3470 https://access.redhat.com/errata/RHSA-2018:3470 |
The Gluster file system implements a series of file system operations in the form of remote procedure calls (RPC). They are transported over the wire using TCP, optionally protected by SSL/TLS. The "mknod" call, derived from mknod(2), can create files pointing to devices ("device special file"). Such device files can be opened on the server using normal I/O operations. As a consequence it's possible to read arbitrary devices.