Published: 28/11/2019 Updated: 07/11/2023

CVSS v2 Base Score: 7.2 | Impact Score: 10 | Exploitability Score: 3.9

CVSS v3 Base Score: 7.8 | Impact Score: 5.9 | Exploitability Score: 1.8

VMScore: 642

Vector: AV:L/AC:L/Au:N/C:C/I:C/A:C

An issue exists in disable_priv_mode in shell.c in GNU Bash up to and including 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.

Vulnerable Product	Search on Vulmon	Subscribe to Product
gnu bash
gnu bash 5.0
netapp solidfire -
netapp hci management node -
netapp oncommand unified manager
oracle communications cloud native core policy 1.14.0

Critical Infrastructure Sectors: Critical Manufacturing

An issue was discovered in disable_priv_mode in shellc in GNU Bash through 50 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 ...

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Setup Trivy in CI/CD tools Trivy is an image vulnerability scanner It detects vulnerabilties in OS packages and application dependencies Test trivy in MacOS Pull image: docker pull aquasec/trivy Scan your image: docker run --rm -v $HOME/Library/Caches:/root/cache/ aquasec/trivy [YOUR_IMAGE_NAME]

Trivy setup using your CI tools

Setup Trivy in CI/CD tools Trivy is an image vulnerability scanner It detects vulnerabilties in OS packages and application dependencies Test trivy in MacOS Pull image: docker pull aquasec/trivy Scan your image: docker run --rm -v $HOME/Library/Caches:/root/cache/ aquasec/trivy [YOUR_IMAGE_NAME]

CWE-273 https://www.youtube.com/watch?v=-wGtxJ8opa8 https://github.com/bminor/bash/commit/951bdaad7a18cc0dc1036bba86b18b90874d39ff http://packetstormsecurity.com/files/155498/Bash-5.0-Patch-11-Privilege-Escalation.html https://security.netapp.com/advisory/ntap-20200430-0003/https://security.gentoo.org/glsa/202105-34 https://www.oracle.com/security-alerts/cpuapr2022.html https://lists.apache.org/thread.html/rf9fa47ab66495c78bb4120b0754dd9531ca2ff0430f6685ac9b07772%40%3Cdev.mina.apache.org%3E https://nvd.nist.gov https://github.com/docker/scan-cli-plugin https://packetstormsecurity.com/files/155498/Bash-5.0-Patch-11-Privilege-Escalation.html https://www.cisa.gov/news-events/ics-advisories/icsa-23-348-10

CVE-2019-18276

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