CVE-2015-6855: Divide by Zero
First published: Fri Nov 06 2015(Updated: )
hw/ide/core.c in QEMU does not properly restrict the commands accepted by an ATAPI device, which allows guest users to cause a denial of service or possibly have unspecified other impact via certain IDE commands, as demonstrated by a WIN_READ_NATIVE_MAX command to an empty drive, which triggers a divide-by-zero error and instance crash.
Credit: secalert@redhat.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| QEMU | <=2.4.1 | |
| Debian | =7.0 | |
| Debian | =8.0 | |
| Debian | =9.0 | |
| Fedora | =21 | |
| Fedora | =22 | |
| Fedora | =23 | |
| SUSE Linux Enterprise Desktop | =12 | |
| SUSE Linux Enterprise Server | =12 | |
| Ubuntu | =12.04 | |
| Ubuntu | =14.04 | |
| Ubuntu | =15.04 | |
| Arista EOS |
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Reference Links
- http://lists.fedoraproject.org/pipermail/package-announce/2015-October/168602.html
- http://lists.fedoraproject.org/pipermail/package-announce/2015-October/169036.html
- http://lists.fedoraproject.org/pipermail/package-announce/2015-October/169039.html
- http://lists.fedoraproject.org/pipermail/package-announce/2015-October/169327.html
- http://lists.fedoraproject.org/pipermail/package-announce/2015-October/169341.html
- http://lists.fedoraproject.org/pipermail/package-announce/2015-September/167369.html
- http://lists.opensuse.org/opensuse-security-announce/2015-10/msg00019.html
- http://www.debian.org/security/2015/dsa-3361
- http://www.debian.org/security/2015/dsa-3362
- http://www.openwall.com/lists/oss-security/2015/09/10/1
- http://www.openwall.com/lists/oss-security/2015/09/10/2
- http://www.securityfocus.com/bid/76691
- http://www.ubuntu.com/usn/USN-2745-1
- https://lists.gnu.org/archive/html/qemu-devel/2015-09/msg02479.html
- https://security.gentoo.org/glsa/201602-01
- https://www.arista.com/en/support/advisories-notices/security-advisories/1188-security-advisory-14
Frequently Asked Questions
What is the severity of CVE-2015-6855?
CVE-2015-6855 is classified as a medium severity vulnerability due to its potential for denial of service.
How do I fix CVE-2015-6855?
To fix CVE-2015-6855, update QEMU to version 2.4.2 or later, or apply the appropriate patches provided by your distribution.
Which software is affected by CVE-2015-6855?
CVE-2015-6855 affects multiple versions of QEMU and various Linux distributions including Debian, Fedora, SUSE, and Ubuntu.
What kind of impact can CVE-2015-6855 have?
CVE-2015-6855 can lead to denial of service or potentially other unspecified impacts when exploited.
When was CVE-2015-6855 reported?
CVE-2015-6855 was reported in October 2015.
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