Out-of-Bounds

Affecting bash package, versions <4.3-1

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NVD Description

Note: Versions mentioned in the description apply to the upstream bash package. See Remediation section below for Debian:10 relevant versions.

A heap-based buffer overflow exists in GNU Bash before 4.3 when wide characters, not supported by the current locale set in the LC_CTYPE environment variable, are printed through the echo built-in function. A local attacker, who can provide data to print through the "echo -e" built-in function, may use this flaw to crash a script or execute code with the privileges of the bash process. This occurs because ansicstr() in lib/sh/strtrans.c mishandles u32cconv().

Remediation

Upgrade Debian:10 bash to version 4.3-1 or higher.

References

CVSS Score

7.8
high severity
  • Attack Vector
    Local
  • Attack Complexity
    Low
  • Privileges Required
    Low
  • User Interaction
    None
  • Scope
    Unchanged
  • Confidentiality
    High
  • Integrity
    High
  • Availability
    High
CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CVE
CVE-2012-6711
CWE
CWE-119
Snyk ID
SNYK-DEBIAN10-BASH-450811
Disclosed
18 Jun, 2019
Published
23 Jun, 2019