Privilege Dropping / Lowering Errors Affecting bash-doc package, versions *


Severity

Recommended
low

Based on Red Hat Enterprise Linux security rating.

Threat Intelligence

Exploit Maturity
Mature
EPSS
0.18% (55th percentile)

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  • Snyk IDSNYK-RHEL7-BASHDOC-1386141
  • published26 Jul 2021
  • disclosed1 Jul 2019

Introduced: 1 Jul 2019

CVE-2019-18276  (opens in a new tab)
CWE-271  (opens in a new tab)

How to fix?

There is no fixed version for RHEL:7 bash-doc.

NVD Description

Note: Versions mentioned in the description apply only to the upstream bash-doc package and not the bash-doc package as distributed by RHEL. See How to fix? for RHEL:7 relevant fixed versions and status.

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.

CVSS Scores

version 3.1