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Improper Check for Dropped Privileges The advisory has been revoked - it doesn't affect any version of package bash Open this link in a new tab

    Threat Intelligence

    Exploit Maturity Mature
    EPSS 0.11% (43rd percentile)
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NVD
7.8 high
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Red Hat
7.8 high

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  • Snyk ID SNYK-UBUNTU1904-BASH-542618
  • published 28 Nov 2019
  • disclosed 28 Nov 2019
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Introduced: 28 Nov 2019

CVE-2019-18276 Open this link in a new tab
CWE-273 Open this link in a new tab

Amendment

The Ubuntu security team deemed this advisory irrelevant for Ubuntu:19.04.

NVD Description

Note: Versions mentioned in the description apply only to the upstream bash package and not the bash package as distributed by Ubuntu.

An issue was discovered in disable_priv_mode in shell.c in GNU Bash through 5.0 patch 11. By default, if Bash is run with its effective UID not equal to its real UID, it will drop privileges by setting its effective UID to its real UID. However, it does so incorrectly. On Linux and other systems that support "saved UID" functionality, the saved UID is not dropped. An attacker with command execution in the shell can use "enable -f" for runtime loading of a new builtin, which can be a shared object that calls setuid() and therefore regains privileges. However, binaries running with an effective UID of 0 are unaffected.