Use After Free Affecting bash package, versions <4.3-14ubuntu1.2


Severity

Recommended
low

Based on Ubuntu security rating

    Threat Intelligence

    EPSS
    0.04% (6th percentile)

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  • Snyk ID SNYK-UBUNTU1604-BASH-351565
  • published 23 Jan 2017
  • disclosed 23 Jan 2017

How to fix?

Upgrade Ubuntu:16.04 bash to version 4.3-14ubuntu1.2 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream bash package and not the bash package as distributed by Ubuntu. See How to fix? for Ubuntu:16.04 relevant fixed versions and status.

popd in bash might allow local users to bypass the restricted shell and cause a use-after-free via a crafted address.

CVSS Scores

version 3.1
Expand this section

NVD

5.5 medium
  • Attack Vector (AV)
    Local
  • Attack Complexity (AC)
    Low
  • Privileges Required (PR)
    Low
  • User Interaction (UI)
    None
  • Scope (S)
    Unchanged
  • Confidentiality (C)
    None
  • Integrity (I)
    None
  • Availability (A)
    High