CVE-2015-1779

The VNC websocket frame decoder in QEMU allows remote attackers to cause a denial of service (memory and CPU consumption) via a large (1) websocket payload or (2) HTTP headers section.

Weakness

The product does not properly control the allocation and maintenance of a limited resource.

Affected Software

Name	Vendor	Start Version	End Version
Qemu	Qemu	*	2.2.1 (including)
Qemu	Qemu	2.3.0-rc0 (including)	2.3.0-rc0 (including)
Qemu	Qemu	2.3.0-rc1 (including)	2.3.0-rc1 (including)
Red Hat Enterprise Linux 7	RedHat	qemu-kvm-10:1.5.3-86.el7_1.8	*
RHEV 3.X Hypervisor and Agents for RHEL-7	RedHat	qemu-kvm-rhev-10:2.1.2-23.el7_1.10	*
Qemu	Ubuntu	devel	*
Qemu	Ubuntu	esm-infra-legacy/trusty	*
Qemu	Ubuntu	trusty	*
Qemu	Ubuntu	trusty/esm	*
Qemu	Ubuntu	utopic	*
Qemu	Ubuntu	vivid	*

Potential Mitigations

Mitigation of resource exhaustion attacks requires that the target system either:
The first of these solutions is an issue in itself though, since it may allow attackers to prevent the use of the system by a particular valid user. If the attacker impersonates the valid user, they may be able to prevent the user from accessing the server in question.
The second solution is simply difficult to effectively institute – and even when properly done, it does not provide a full solution. It simply makes the attack require more resources on the part of the attacker.

NVD	https://nvd.nist.gov/vuln/detail/CVE-2015-1779
CWE	https://cwe.mitre.org/data/definitions/400.html

Uncontrolled Resource Consumption

Weakness

Affected Software

Potential Mitigations

References

CVE-2015-1779

Uncontrolled Resource Consumption

Weakness

Affected Software

Potential Mitigations

Related Attack Patterns

References