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amazonAmazonALAS-2017-878
HistoryAug 31, 2017 - 3:53 p.m.

Medium: bash

2017-08-3115:53:00
alas.aws.amazon.com
45

8.4 High

CVSS3

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

CVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

7.2 High

CVSS2

Access Vector

LOCAL

Access Complexity

LOW

Authentication

NONE

Confidentiality Impact

COMPLETE

Integrity Impact

COMPLETE

Availability Impact

COMPLETE

AV:L/AC:L/Au:N/C:C/I:C/A:C

0.016 Low

EPSS

Percentile

87.0%

Issue Overview:

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)

Affected Packages:

bash

Issue Correction:
Run yum update bash to update your system.

New Packages:

i686:  
    bash-doc-4.2.46-28.37.amzn1.i686  
    bash-4.2.46-28.37.amzn1.i686  
    bash-debuginfo-4.2.46-28.37.amzn1.i686  
  
src:  
    bash-4.2.46-28.37.amzn1.src  
  
x86_64:  
    bash-debuginfo-4.2.46-28.37.amzn1.x86_64  
    bash-4.2.46-28.37.amzn1.x86_64  
    bash-doc-4.2.46-28.37.amzn1.x86_64  

Additional References

Red Hat: CVE-2016-0634, CVE-2016-7543, CVE-2016-9401

Mitre: CVE-2016-0634, CVE-2016-7543, CVE-2016-9401

8.4 High

CVSS3

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

CVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

7.2 High

CVSS2

Access Vector

LOCAL

Access Complexity

LOW

Authentication

NONE

Confidentiality Impact

COMPLETE

Integrity Impact

COMPLETE

Availability Impact

COMPLETE

AV:L/AC:L/Au:N/C:C/I:C/A:C

0.016 Low

EPSS

Percentile

87.0%