Amazon Linux AMI update for glib2

1) Permissions, Privileges, and Access Controls

EUVDB-ID: #VU18658

Risk: Low

CVSSv4.0: 0.4 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2019-12450

CWE-ID: CWE-264 - Permissions, Privileges, and Access Controls

Exploit availability: No

Description

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

The vulnerability exists due to the application applies default directory permissions to files while copying them in file_copy_fallback() function in gio/gfile.c. A local user can interfere with the copying operation and gain access to otherwise restricted files, as the application applies correct access permissions after the file was copied only.

Such application behavior allows a local user to access potentially sensitive data or modify file contents in case directory permissions that were applied to the file allow such operations.

Mitigation

Update the affected packages:

i686:
    glib2-2.36.3-5.21.amzn1.i686
    glib2-fam-2.36.3-5.21.amzn1.i686
    glib2-debuginfo-2.36.3-5.21.amzn1.i686
    glib2-devel-2.36.3-5.21.amzn1.i686

noarch:
    glib2-doc-2.36.3-5.21.amzn1.noarch

src:
    glib2-2.36.3-5.21.amzn1.src

x86_64:
    glib2-debuginfo-2.36.3-5.21.amzn1.x86_64
    glib2-2.36.3-5.21.amzn1.x86_64
    glib2-fam-2.36.3-5.21.amzn1.x86_64
    glib2-devel-2.36.3-5.21.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-2019-1256.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.