Amazon Linux AMI update for qemu-kvm

1) Memory leak

EUVDB-ID: #VU18303

Risk: Low

CVSSv3.1: 3.3 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2019-9824

CWE-ID: CWE-401 - Missing release of memory after effective lifetime

Exploit availability: No

Description

The vulnerability allows a local user to gain access to sensitive information on the system.

The vulnerability exists due memory leak within the SLiRP networking implementation. A local user can read uninitialised stack memory contents.

Mitigation

Update the affected packages:

src:
    qemu-kvm-1.5.3-156.19.amzn1.src

x86_64:
    qemu-kvm-debuginfo-1.5.3-156.19.amzn1.x86_64
    qemu-kvm-1.5.3-156.19.amzn1.x86_64
    qemu-kvm-tools-1.5.3-156.19.amzn1.x86_64
    qemu-kvm-common-1.5.3-156.19.amzn1.x86_64
    qemu-img-1.5.3-156.19.amzn1.x86_64

Vulnerable software versions

Amazon Linux AMI: All versions

External links

http://alas.aws.amazon.com/ALAS-2020-1400.html

Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

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

2) Heap-based buffer overflow

EUVDB-ID: #VU25458

Risk: Low

CVSSv3.1: 6.8 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-7039

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

Exploit availability: No

Description

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

The vulnerability exists due to a boundary error within the tcp_emu() function in tcp_subr.c in libslirp. An attacker can issue specially crafted IRC DCC commands in EMU_IRC, trigger heap-based buffer overflow and execute arbitrary code on the target system.

Mitigation

Update the affected packages:

src:
    qemu-kvm-1.5.3-156.19.amzn1.src

x86_64:
    qemu-kvm-debuginfo-1.5.3-156.19.amzn1.x86_64
    qemu-kvm-1.5.3-156.19.amzn1.x86_64
    qemu-kvm-tools-1.5.3-156.19.amzn1.x86_64
    qemu-kvm-common-1.5.3-156.19.amzn1.x86_64
    qemu-img-1.5.3-156.19.amzn1.x86_64

Vulnerable software versions

Amazon Linux AMI: All versions

External links

http://alas.aws.amazon.com/ALAS-2020-1400.html

Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

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

3) Buffer overflow

EUVDB-ID: #VU25456

Risk: Low

CVSSv3.1: 6.8 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-8608

CWE-ID: CWE-119 - Memory corruption

Exploit availability: No

Description

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to a boundary error within tcp_subr.c file in libslirp. A local user can pass specially crafted data to the application that is using the affected version of library, trigger memory corruption and execute arbitrary code on the system.

Mitigation

Update the affected packages:

src:
    qemu-kvm-1.5.3-156.19.amzn1.src

x86_64:
    qemu-kvm-debuginfo-1.5.3-156.19.amzn1.x86_64
    qemu-kvm-1.5.3-156.19.amzn1.x86_64
    qemu-kvm-tools-1.5.3-156.19.amzn1.x86_64
    qemu-kvm-common-1.5.3-156.19.amzn1.x86_64
    qemu-img-1.5.3-156.19.amzn1.x86_64

Vulnerable software versions

Amazon Linux AMI: All versions

External links

http://alas.aws.amazon.com/ALAS-2020-1400.html

Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

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