Executive Summary

Name CVE-2019-18276 First vendor Publication 2019-11-28
Vendor Cve Last vendor Modification 2021-05-26

Security-Database Scoring CVSS v3

Cvss vector : CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Overall CVSS Score 7.8
Base Score 7.8 Environmental Score 7.8
impact SubScore 5.9 Temporal Score 7.8
Exploitabality Sub Score 1.8
Attack Vector Local Attack Complexity Low
Privileges Required Low User Interaction None
Scope Unchanged Confidentiality Impact High
Integrity Impact High Availability Impact High
Calculate full CVSS 3.0 Vectors scores

Security-Database Scoring CVSS v2

Cvss vector : (AV:L/AC:L/Au:N/C:C/I:C/A:C)
Cvss Base Score 7.2 Attack Range Local
Cvss Impact Score 10 Attack Complexity Low
Cvss Expoit Score 3.9 Authentication None Required
Calculate full CVSS 2.0 Vectors scores


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.

Original Source

Url : http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-18276

CWE : Common Weakness Enumeration

% Id Name
100 % CWE-273 Improper Check for Dropped Privileges

CPE : Common Platform Enumeration

Application 50
Application 1
Application 1
Application 1

Sources (Detail)

Source Url
CONFIRM https://github.com/bminor/bash/commit/951bdaad7a18cc0dc1036bba86b18b90874d39ff
GENTOO https://security.gentoo.org/glsa/202105-34
MISC http://packetstormsecurity.com/files/155498/Bash-5.0-Patch-11-Privilege-Escal...
MLIST https://lists.apache.org/thread.html/rf9fa47ab66495c78bb4120b0754dd9531ca2ff0...

Alert History

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Date Informations
2021-05-26 17:23:11
  • Multiple Updates
2021-05-05 01:34:36
  • Multiple Updates
2021-05-04 13:32:07
  • Multiple Updates
2021-04-22 02:46:37
  • Multiple Updates
2021-03-26 12:29:38
  • Multiple Updates
2020-09-15 01:24:32
  • Multiple Updates
2020-06-16 01:23:42
  • Multiple Updates
2020-05-23 02:26:55
  • First insertion