FreeBSD : qemu and xen-tools -- denial of service vulnerabilities in AMD PC-Net II NIC support (405446f4-b1b3-11e5-9728-002590263bf5)

critical Nessus Plugin ID 87691

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Synopsis

The remote FreeBSD host is missing one or more security-related updates.

Description

Prasad J Pandit, Red Hat Product Security Team, reports :

Qemu emulator built with the AMD PC-Net II Ethernet Controller support is vulnerable to a heap buffer overflow flaw. While receiving packets in the loopback mode, it appends CRC code to the receive buffer. If the data size given is same as the receive buffer size, the appended CRC code overwrites 4 bytes beyond this 's->buffer' array.

A privileged(CAP_SYS_RAWIO) user inside guest could use this flaw to crash the Qemu instance resulting in DoS or potentially execute arbitrary code with privileges of the Qemu process on the host.

The AMD PC-Net II emulator(hw/net/pcnet.c), while receiving packets from a remote host(non-loopback mode), fails to validate the received data size, thus resulting in a buffer overflow issue. It could potentially lead to arbitrary code execution on the host, with privileges of the Qemu process. It requires the guest NIC to have larger MTU limit.

A remote user could use this flaw to crash the guest instance resulting in DoS or potentially execute arbitrary code on a remote host with privileges of the Qemu process.

Solution

Update the affected packages.

See Also

https://www.openwall.com/lists/oss-security/2015/11/30/2

https://www.openwall.com/lists/oss-security/2015/11/30/3

http://www.nessus.org/u?816ec3d4

http://www.nessus.org/u?a347bda6

http://www.nessus.org/u?81b29577

http://www.nessus.org/u?98c7fdb7

http://xenbits.xen.org/xsa/advisory-162.html

http://www.nessus.org/u?c52ec24c

Plugin Details

Severity: Critical

ID: 87691

File Name: freebsd_pkg_405446f4b1b311e59728002590263bf5.nasl

Version: 2.10

Type: local

Published: 1/4/2016

Updated: 1/4/2021

Dependencies: ssh_get_info.nasl

Risk Information

VPR

Risk Factor: High

Score: 8.1

CVSS v2

Risk Factor: Medium

Base Score: 6.8

Vector: AV:N/AC:M/Au:N/C:P/I:P/A:P

CVSS v3

Risk Factor: Critical

Base Score: 9

Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H

Vulnerability Information

CPE: p-cpe:/a:freebsd:freebsd:qemu, p-cpe:/a:freebsd:freebsd:qemu-devel, p-cpe:/a:freebsd:freebsd:qemu-sbruno, p-cpe:/a:freebsd:freebsd:qemu-user-static, p-cpe:/a:freebsd:freebsd:xen-tools, cpe:/o:freebsd:freebsd

Required KB Items: Host/local_checks_enabled, Host/FreeBSD/release, Host/FreeBSD/pkg_info

Patch Publication Date: 1/3/2016

Vulnerability Publication Date: 11/30/2015

Reference Information

CVE: CVE-2015-7504, CVE-2015-7512