Amazon Linux AMI update for qemu-kvm

1) Use-after-free

EUVDB-ID: #VU20964

Risk: Medium

CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2019-15890

CWE-ID: CWE-416 - Use After Free

Exploit availability: No

Description

The vulnerability allows a remote attacker to compromise vulnerable system.

The vulnerability exists in "ip_reass()" routine in "ip_input.c" file while reassembling incoming packets, if the first fragment is bigger than the m->m_dat[] buffer. A remote attacker can send a specially crafted packet and cause the application to crash.

Mitigation

Update the affected packages:

src:
    qemu-kvm-1.5.3-156.25.amzn1.src

x86_64:
    qemu-kvm-1.5.3-156.25.amzn1.x86_64
    qemu-kvm-tools-1.5.3-156.25.amzn1.x86_64
    qemu-kvm-common-1.5.3-156.25.amzn1.x86_64
    qemu-img-1.5.3-156.25.amzn1.x86_64
    qemu-kvm-debuginfo-1.5.3-156.25.amzn1.x86_64

Vulnerable software versions

Amazon Linux AMI: All versions

CPE2.3

• cpe:2.3:o:amazon_web_services:amazon_linux_ami:*:*:*:*:*:*:*:*

External links

https://alas.aws.amazon.com/ALAS-2021-1467.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.