Bug 481376 - (CVE-2008-5714) CVE-2008-5714 qemu: off-by-one error in monitor.c causing VNC passwords to be truncated after 7th character
CVE-2008-5714 qemu: off-by-one error in monitor.c causing VNC passwords to be...
Product: Security Response
Classification: Other
Component: vulnerability (Show other bugs)
All Linux
low Severity low
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Assigned To: Red Hat Product Security
: Security
Depends On:
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Reported: 2009-01-23 15:12 EST by Josh Bressers
Modified: 2016-03-04 07:48 EST (History)
8 users (show)

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Fixed In Version:
Doc Type: Bug Fix
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Last Closed: 2010-03-29 06:50:31 EDT
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RHEL 7.3 requirements from Atomic Host:
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Description Josh Bressers 2009-01-23 15:12:36 EST
Off-by-one error in monitor.c in Qemu 0.9.1 might make it easier for remote attackers to guess the VNC password, which is limited to seven characters where eight was intended.

Comment 1 Tomas Hoger 2009-01-26 05:59:21 EST
More information on setting VNC passwords for Qemu/KVM guests can be found here:

Looking at various version of Qemu, KVM and Xen shipped, following seem to be affected:

- Qemu - All versions shipped in stable Fedora versions are currently based on upstream version 0.9.1 that contains this flaw.

- KVM - Current versions in stable Fedora versions (65-15.fc9 and 74-10.fc10) contain this problem as well.  Issue was fixed in KVM upstream git report via:
and the fix is included in version 82 and later.

- Xen - Version of Xen as shipped in Red Hat Enterprise Linux 5 (3.0.3-80.el5) and Fedora 9 (3.2.0-15.fc9) are not affected by this flaw (longer (256) buffer used, full buffer size passed to monitor_readline()).  The flaw exists in Fedora 10 and Rawhide Xen versions (3.3.0-1.fc10 and 3.3.1-2.fc11, ioemu-qemu-xen).

Is there any way to run Qemu / KVM with monitor enabled when used with libvirt?  From the search through the XML format spec, there does not seem to be any option to enable it.  Is there a way to enable monitor in qemu-dm used by Xen?
Comment 2 Glauber Costa 2009-01-26 06:39:27 EST
Oh god, will those CVEs on vnc ever stop?

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