Memory leak in QEMU - CVE-2017-5856
Published: March 16, 2017 / Updated: July 28, 2020
Vulnerability identifier: #VU32084
CSH Severity: Medium
CVSS v4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2017-5856
CWE-ID: CWE-401
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to memory leak within the megasas_handle_dcmd function in hw/scsi/megasas.c in QEMU (aka Quick Emulator) allows local guest OS privileged users to cause a denial of service (host memory consumption) via MegaRAID Firmware Interface (MFI) commands with the sglist size set to a value over 2 Gb. A remote attacker can perform a denial of service attack.
Affected software
QEMU
Gentoo Linux
qemu (Alpine package)
Gentoo Linux
qemu (Alpine package)
How to mitigate CVE-2017-5856
Cybersecurity Help is currently unaware of any official solution to address this vulnerability.
qemu (Alpine package) - addressed in versions 2.8.1-r1, 2.8.1.1-r0
External References
- http://git.qemu-project.org/?p=qemu.git;a=commit;h=765a707000e838c30b18d712fe6cb3dd8e0435f3
- http://www.openwall.com/lists/oss-security/2017/02/01/19
- http://www.openwall.com/lists/oss-security/2017/02/02/14
- http://www.securityfocus.com/bid/95999
- https://bugzilla.redhat.com/show_bug.cgi?id=1418342
- https://lists.debian.org/debian-lts-announce/2018/09/msg00007.html
- https://security.gentoo.org/glsa/201702-28