Amazon Linux AMI update for kernel

Published: 2018-07-26

Risk	Low
Patch available	YES
Number of vulnerabilities	1
CVE-ID	CVE-2018-11412
CWE-ID	CWE-119
Exploitation vector	Local
Public exploit	N/A
Vulnerable software	Amazon Linux AMI Operating systems & Components / Operating system
Vendor	Amazon Web Services

Security Bulletin

This security bulletin contains one low risk vulnerability.

1) Memory corruption

EUVDB-ID: #VU13071

Risk: Low

CVSSv4.0: 5.9 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2018-11412

CWE-ID: CWE-119 - Memory corruption

Exploit availability: No

Description

The vulnerability allows a local attacker to gain elevated privileges or cause DoS condition on the target system.

The vulnerability exists due to improper memory operations performed by the ext4_read_inline_data() function, as defined in the fs/ext4/inline.c source code file. A local attacker can mount a customized ext4 filesystem that stores the system.data extended attribute value in a dedicated inode, supply malicious input containing an untrusted length value, trigger memory corruption and gain elevated privileges or cause a DoS condition.

Mitigation

Update the affected packages.

i686:
    kernel-headers-4.14.55-62.37.amzn1.i686
    kernel-tools-debuginfo-4.14.55-62.37.amzn1.i686
    kernel-tools-4.14.55-62.37.amzn1.i686
    kernel-debuginfo-common-i686-4.14.55-62.37.amzn1.i686
    kernel-devel-4.14.55-62.37.amzn1.i686
    perf-debuginfo-4.14.55-62.37.amzn1.i686
    kernel-tools-devel-4.14.55-62.37.amzn1.i686
    perf-4.14.55-62.37.amzn1.i686
    kernel-debuginfo-4.14.55-62.37.amzn1.i686
    kernel-4.14.55-62.37.amzn1.i686

src:
    kernel-4.14.55-62.37.amzn1.src

x86_64:
    kernel-4.14.55-62.37.amzn1.x86_64
    kernel-debuginfo-4.14.55-62.37.amzn1.x86_64
    kernel-tools-devel-4.14.55-62.37.amzn1.x86_64
    kernel-devel-4.14.55-62.37.amzn1.x86_64
    kernel-tools-4.14.55-62.37.amzn1.x86_64
    perf-debuginfo-4.14.55-62.37.amzn1.x86_64
    kernel-tools-debuginfo-4.14.55-62.37.amzn1.x86_64
    perf-4.14.55-62.37.amzn1.x86_64
    kernel-debuginfo-common-x86_64-4.14.55-62.37.amzn1.x86_64
    kernel-headers-4.14.55-62.37.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-2018-1046.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.