Amazon Linux AMI update for kernel

Published: 2015-11-23

Risk	Low
Patch available	YES
Number of vulnerabilities	1
CVE-ID	CVE-2015-7872
CWE-ID	CWE-20
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) Improper input validation

EUVDB-ID: #VU2510

Risk: Low

CVSSv4.0: 4.3 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2015-7872

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

The vulnerability allows a local attacker to cause DoS condition on the target system.

The weakness exists in the key_gc_unused_keys function in security/keys/gc.c due to improper input validation. A local attacker can submit specially crafted keyctl commands and cause the service to crash.

Mitigation

Update the affected packages.

i686:
    kernel-devel-4.1.13-18.26.amzn1.i686
    kernel-tools-devel-4.1.13-18.26.amzn1.i686
    kernel-debuginfo-common-i686-4.1.13-18.26.amzn1.i686
    kernel-tools-debuginfo-4.1.13-18.26.amzn1.i686
    perf-debuginfo-4.1.13-18.26.amzn1.i686
    perf-4.1.13-18.26.amzn1.i686
    kernel-debuginfo-4.1.13-18.26.amzn1.i686
    kernel-4.1.13-18.26.amzn1.i686
    kernel-headers-4.1.13-18.26.amzn1.i686
    kernel-tools-4.1.13-18.26.amzn1.i686

noarch:
    kernel-doc-4.1.13-18.26.amzn1.noarch

src:
    kernel-4.1.13-18.26.amzn1.src

x86_64:
    kernel-headers-4.1.13-18.26.amzn1.x86_64
    kernel-tools-4.1.13-18.26.amzn1.x86_64
    kernel-tools-devel-4.1.13-18.26.amzn1.x86_64
    perf-debuginfo-4.1.13-18.26.amzn1.x86_64
    kernel-debuginfo-4.1.13-18.26.amzn1.x86_64
    kernel-4.1.13-18.26.amzn1.x86_64
    kernel-devel-4.1.13-18.26.amzn1.x86_64
    kernel-debuginfo-common-x86_64-4.1.13-18.26.amzn1.x86_64
    kernel-tools-debuginfo-4.1.13-18.26.amzn1.x86_64
    perf-4.1.13-18.26.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-2015-610.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.