Detections
Analytics
Amazon Linux AMI : bash (ALAS-2017-878)
high Nessus Plugin ID 102866
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Synopsis
The remote Amazon Linux AMI host is missing a security update.Description
popd controlled free :A denial of service flaw was found in the way bash handled popd commands. A poorly written shell script could cause bash to crash resulting in a local denial of service limited to a specific bash session.(CVE-2016-9401)
Arbitrary code execution via malicious hostname :
An arbitrary command injection flaw was found in the way bash processed the hostname value. A malicious DHCP server could use this flaw to execute arbitrary commands on the DHCP client machines running bash under specific circumstances.(CVE-2016-0634)
Specially crafted SHELLOPTS+PS4 variables allows command substitution :
An arbitrary command injection flaw was found in the way bash processed the SHELLOPTS and PS4 environment variables. A local, authenticated attacker could use this flaw to exploit poorly written setuid programs to elevate their privileges under certain circumstances. (CVE-2016-7543)
Solution
Run 'yum update bash' to update your system.See Also
Plugin Details
Severity: High
ID: 102866
File Name: ala_ALAS-2017-878.nasl
Version: 3.2
Type: local
Agent: unix
Published: 9/1/2017
Updated: 4/18/2018
Supported Sensors: Frictionless Assessment AWS, Frictionless Assessment Agent, Nessus Agent, Agentless Assessment, Continuous Assessment, Nessus
Risk Information
VPR
Risk Factor: Medium
Score: 5.9
CVSS v2
Risk Factor: High
Base Score: 7.2
Vector: CVSS2#AV:L/AC:L/Au:N/C:C/I:C/A:C
CVSS v3
Risk Factor: High
Base Score: 8.4
Vector: CVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Vulnerability Information
CPE: p-cpe:/a:amazon:linux:bash-debuginfo, p-cpe:/a:amazon:linux:bash, cpe:/o:amazon:linux, p-cpe:/a:amazon:linux:bash-doc
Required KB Items: Host/local_checks_enabled, Host/AmazonLinux/release, Host/AmazonLinux/rpm-list
Patch Publication Date: 8/31/2017
Reference Information
CVE: CVE-2016-0634, CVE-2016-7543, CVE-2016-9401
ALAS: 2017-878