CVE-2016-2858
First published: Fri Mar 04 2016(Updated: )
Qemu emulator built with the Pseudo Random Number Generator(PRNG) back-end support is vulnerable to an arbitrary stack based allocation and memory corruption via random bytes issue. It could occur when a guest requests for entropy for random number generation. A user/process inside guest could use this flaw to crash the Qemu process resulting in DoS. Upstream patch: --------------- -> <a href="http://git.qemu.org/?p=qemu.git;a=commit;h=60253ed1e6ec6d8e5ef2efe7bf755f475">http://git.qemu.org/?p=qemu.git;a=commit;h=60253ed1e6ec6d8e5ef2efe7bf755f475</a> Reference: ---------- -> <a href="http://www.openwall.com/lists/oss-security/2016/03/04/1">http://www.openwall.com/lists/oss-security/2016/03/04/1</a>
Credit: secalert@redhat.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| QEMU KVM | <=2.5.1.1 | |
| Ubuntu | =12.04 | |
| Ubuntu | =14.04 | |
| Ubuntu | =15.10 | |
| Ubuntu | =16.04 | |
| Debian | =8.0 |
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Reference Links
- http://git.qemu.org/?p=qemu.git;a=commit;h=60253ed1e6ec6d8e5ef2efe7bf755f475
- http://www.openwall.com/lists/oss-security/2016/03/04/1
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1314678
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1314677
- https://access.redhat.com/support/policy/updates/errata/
- https://bugzilla.redhat.com/show_bug.cgi?id=1314676
- http://git.qemu.org/?p=qemu.git%3Ba=commit%3Bh=60253ed1e6ec6d8e5ef2efe7bf755f475dce9956
- http://www.openwall.com/lists/oss-security/2016/03/07/4
- http://www.securityfocus.com/bid/84134
- http://www.ubuntu.com/usn/USN-2974-1
- https://lists.debian.org/debian-lts-announce/2018/11/msg00038.html
- https://security.gentoo.org/glsa/201604-01
Frequently Asked Questions
What is the severity of CVE-2016-2858?
CVE-2016-2858 is considered a medium severity vulnerability due to its potential for memory corruption.
How do I fix CVE-2016-2858?
To fix CVE-2016-2858, users should upgrade to a version of QEMU later than 2.5.1.1 that resolves this vulnerability.
What impact does CVE-2016-2858 have on systems?
CVE-2016-2858 can lead to arbitrary stack-based memory corruption, potentially allowing an attacker to execute arbitrary code.
Which software is affected by CVE-2016-2858?
CVE-2016-2858 affects QEMU versions up to and including 2.5.1.1, as well as specific versions of Ubuntu and Debian Linux.
Who can exploit CVE-2016-2858?
An attacker with access to a guest environment can exploit CVE-2016-2858 by requesting entropy for random number generation.
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