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CVE-2019-18276

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.

Risk Information

Base Score
7.8
MODERATE
Vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS Score
Exploitation Probability
49.613

Associated Vulnerability

VulnerabilityOS Platform
(RHSA-2021:1679) bash security and bug fix update bash-4.4.19-14.el8.x86_64.rpmLinux
(RHSA-2021:1679) bash security and bug fix update bash-debugsource-4.4.19-14.el8.x86_64.rpmLinux
(RHSA-2021:1679) bash security and bug fix update bash-doc-4.4.19-14.el8.x86_64.rpmLinux
(RHSA-2021:1679)Low: security and bug fix update bash-debuginfo-4.4.19-14.el8.x86_64.rpmLinux
GNU Bourne Again SHell (USN-5380-1) bash_5.0-6ubuntu1.2_i386.debLinux
GNU Bourne Again SHell (USN-5380-1) bash_5.0-6ubuntu1.2_amd64.debLinux
GNU Bourne Again SHell (USN-5380-1) bash_4.4.18-2ubuntu1.3_i386.debLinux
GNU Bourne Again SHell (USN-5380-1) bash_4.4.18-2ubuntu1.3_amd64.debLinux
Bash update (ELSA-2021-1679) bash-4.4.19-14.el8.x86_64.rpmLinux
Bash-doc update (ELSA-2021-1679) bash-doc-4.4.19-14.el8.x86_64.rpmLinux
Improper Check for Dropped Privileges Vulnerability (CVE-2019-18276)NCM

Patch Details

No records found

References

https://nvd.nist.gov/vuln/detail/CVE-2023-1234
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-1234