Amazon Linux AMI update for qemu-kvm

1) Heap-based buffer overflow

EUVDB-ID: #VU13375

Risk: Low

CVSSv3.1: 4.6 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:U/RL:O/RC:C]

CVE-ID: CVE-2018-11806

CWE-ID: CWE-122 - Heap-based Buffer Overflow

Exploit availability: No

Description

The vulnerability allows a remote authenticated attacker to cause DoS condition on the target system.

The vulnerability exists due to heap-based buffer overflow when insufficient input and validation checking of Slirp networking back-end processes by the m_cat function, as defined in the slirp/mbuf.c source code file. A remote attacker can send malformed, fragmented packets, trigger memory corruption and cause the QEMU process to crash.

Mitigation

Update the affected packages.

src:
    qemu-kvm-1.5.3-156.15.amzn1.src

x86_64:
    qemu-kvm-common-1.5.3-156.15.amzn1.x86_64
    qemu-img-1.5.3-156.15.amzn1.x86_64
    qemu-kvm-1.5.3-156.15.amzn1.x86_64
    qemu-kvm-debuginfo-1.5.3-156.15.amzn1.x86_64
    qemu-kvm-tools-1.5.3-156.15.amzn1.x86_64

Vulnerable software versions

Amazon Linux AMI: All versions

External links

http://alas.aws.amazon.com/ALAS-2018-1073.html

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

2) Memory corruption

EUVDB-ID: #VU11163

Risk: Medium

CVSSv3.1: 8.3 [CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2018-7550

CWE-ID: CWE-119 - Memory corruption

Exploit availability: No

Description

The vulnerability allows an adjacent attacker to execute arbitrary code on the target system.

The weakness exists in the load_multiboot function due to out-of-bounds read or write. An adjacent attacker can load a kernel image during the boot process, which may cause the mh_load_end_addr address to be greater than the mh_bss_end_addr address, trigger memory corruption and execute arbitrary code.

Successful exploitation of the vulnerability may result in system compromise.

Mitigation

Update the affected packages.

src:
    qemu-kvm-1.5.3-156.15.amzn1.src

x86_64:
    qemu-kvm-common-1.5.3-156.15.amzn1.x86_64
    qemu-img-1.5.3-156.15.amzn1.x86_64
    qemu-kvm-1.5.3-156.15.amzn1.x86_64
    qemu-kvm-debuginfo-1.5.3-156.15.amzn1.x86_64
    qemu-kvm-tools-1.5.3-156.15.amzn1.x86_64

Vulnerable software versions

Amazon Linux AMI: All versions

External links

http://alas.aws.amazon.com/ALAS-2018-1073.html

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the local network (LAN).

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.