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CVE-2019-18276

Published: Nov 28, 2019Updated: Jun 9, 2025 Sources: CVE List NVD BDU csafCWE-273
NVD MITRE
7.8CVSSHIGH
EPSS Score
2.6%
Top 16.6%
CISA KEV
Not in KEV
Exploits
3 Known
Remediation
Patch Available

Description

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 Vector Breakdown

AV:LAC:LPR:LUI:NS:UC:HI:HA:H
Exploitability
AV:LAttack Vector
Local
AC:LAttack Complexity
Low
PR:LPrivileges Required
Low
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:HAvailability
High
Open in CVSS calculator →

Weaknesses

CWE-273

Affected Products

n/an/a
bashgnuOSS Libraries
hci management nodenetappHardware Firmware
oncommand unified managernetappHardware Firmware
solidfirenetappHardware Firmware
gnuoss-projectUSOSS Librariesaka g. nu
netappcommercialUSHardware Firmware
and 5 more affected products View all →

Exploitability

3 exploit sources identified

Exploit details including PoC links, Metasploit modules, and scanner templates are available after registration.

View exploit details
Official Patch Available

References

https://lists.apache.org/thread.html/rf9fa47ab66495c78bb4120b0754dd9531ca2ff0430f6685ac9b07772%40%3Cdev.mina.apache.org%3E
lists.apache.org
https://security.gentoo.org/glsa/202105-34
security.gentoo.org
https://www.oracle.com/security-alerts/cpuapr2022.html
oracle.com
and 22 more references View all →

Timeline

Published
Nov 28, 2019
Last Updated
Jun 9, 2025

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