Information disclosure in Linux kernel

1) Information disclosure

EUVDB-ID: #VU18533

Risk: Low

CVSSv3.1: 4.8 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2019-11833

CWE-ID: CWE-200 - Information exposure

Exploit availability: No

Description

The vulnerability allows a local user to gain access to potentially sensitive information.

The vulnerability exists due to the Linux kernel does not zero out the unused memory region in the extent tree block within the fs/ext4/extents.c. A local user can gain unauthorized access to sensitive information on the system.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Linux kernel: 4.4 - 5.1.16

External links

http://github.com/torvalds/linux/commit/592acbf16821288ecdc4192c47e3774a4c48bb64
http://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.19.45
http://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.9.178
http://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.14.121
http://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.2
http://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.4.181

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.