SB2014100208 - Memory corruption in bash (Alpine package)

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Main Vulnerability Database SB2014100208

SB2014100208 - Memory corruption in bash (Alpine package)

Published: October 2, 2014

Security Bulletin ID SB2014100208
Severity
Critical
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Remote access
Highest impact Code execution

Breakdown by Severity

Critical 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 security vulnerability.


1) Memory corruption (CVE-ID: CVE-2014-7186)

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The weakness exists due to out-of-bounds memory access while handling multiple "<<EOF" declarations. A remote attacker can trigger memory corruption and execute arbitrary code.

Exploitation example: 

bash -c 'true <<EOF <<EOF <<EOF <<EOF <<EOF <<EOF <<EOF <<EOF <<EOF <<EOF <<EOF <<EOF <<EOF <<EOF' ||  echo "CVE-2014-7186 vulnerable, redir_stack"

Successful exploitation results in arbitrary code execution on the vulnerable system.

Note: this vulnerability was being actively exploited.


Remediation

Install update from vendor's website.

References