Bug 1460170 (CVE-2017-9524)
| Summary: | CVE-2017-9524 Qemu: nbd: segmentation fault due to client non-negotiation | ||
|---|---|---|---|
| Product: | [Other] Security Response | Reporter: | Prasad Pandit <ppandit> |
| Component: | vulnerability | Assignee: | Red Hat Product Security <security-response-team> |
| Status: | CLOSED ERRATA | QA Contact: | |
| Severity: | medium | Docs Contact: | |
| Priority: | medium | ||
| Version: | unspecified | CC: | ailan, amit, apevec, areis, ayoung, berrange, cfergeau, chrisw, cvsbot-xmlrpc, ddepaula, drjones, dwmw2, eblake, imammedo, itamar, jen, jjoyce, jschluet, kbasil, knoel, lhh, lpeer, markmc, m.a.young, mkenneth, mrezanin, mst, pbonzini, rbryant, rjones, rkrcmar, robinlee.sysu, sclewis, slong, srevivo, tdecacqu, virt-maint, virt-maint, vkuznets, xen-maint |
| Target Milestone: | --- | Keywords: | Security |
| Target Release: | --- | ||
| Hardware: | All | ||
| OS: | Linux | ||
| Whiteboard: | |||
| Fixed In Version: | Doc Type: | Bug Fix | |
| Doc Text: |
Quick Emulator (QEMU) built with Network Block Device (NBD) Server support was vulnerable to a null-pointer dereference issue. The flaw could occur when releasing a client that was not initialized due to failed negotiation. A remote user or process could exploit this flaw to crash the qemu-nbd server (denial of service).
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Story Points: | --- |
| Clone Of: | Environment: | ||
| Last Closed: | 2019-06-08 03:14:56 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: | 1451614, 1460172, 1460173, 1460179, 1460180, 1460181, 1460182, 1460184, 1460185, 1460186, 1460187, 1460188, 1460192, 1476024 | ||
| Bug Blocks: | 1460107 | ||
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Description
Prasad Pandit
2017-06-09 10:15:05 UTC
Created xen tracking bugs for this issue: Affects: fedora-all [bug 1460173] Created qemu tracking bugs for this issue: Affects: fedora-all [bug 1460172] (In reply to Prasad J Pandit from comment #0) > Quick Emulator(Qemu) built with the Network Block Device(NBD) Server support > is vulnerable to a null pointer dereference issue. It could occur while > releasing a client, which was not initialised due to failed negotiation. > > A remote user/process could use this flaw to crash the qemu-nbd server > resulting in DoS. > > Upstream patch: > --------------- > -> https://lists.gnu.org/archive/html/qemu-devel/2017-05/msg06240.html > -> https://lists.gnu.org/archive/html/qemu-devel/2017-06/msg02321.html The description, while factually correct, is incomplete. The real problem is that qemu-nbd must NOT exit due to a port scan. The fact that it was exiting due to a segmentation fault makes it a little more obvious that the code was buggy, but even if NO null pointer dereference occurred, there is STILL a denial of service if a well-timed port scan is able to cause qemu-nbd to exit prior to an actual client being able to connect. This issue has been addressed in the following products: RHEV 3.X Hypervisor and Agents for RHEL-7 RHEV 4.X RHEV-H and Agents for RHEL-7 Via RHSA-2017:1682 https://access.redhat.com/errata/RHSA-2017:1682 This issue has been addressed in the following products: Red Hat Enterprise Linux 7 Via RHSA-2017:1681 https://access.redhat.com/errata/RHSA-2017:1681 This issue has been addressed in the following products: Red Hat OpenStack Platform 10.0 (Newton) Red Hat OpenStack Platform 11.0 (Ocata) Red Hat Enterprise Linux OpenStack Platform 6.0 (Juno) for RHEL 7 Red Hat Enterprise Linux OpenStack Platform 7.0 (Kilo) for RHEL 7 Red Hat OpenStack Platform 8.0 (Liberty) Red Hat OpenStack Platform 9.0 (Mitaka) Via RHSA-2017:2408 https://access.redhat.com/errata/RHSA-2017:2408 |