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CVE-2019-18276

7.8 · HIGH

An issue was discovered in disable_priv_mode in shell.c in GNU Bash through 5.0 patch 11.

Published Nov 28, 2019CWE-273EPSS 2.61%

Overview

CVE-2019-18276 is a high-severity vulnerability. It was published on November 28, 2019 and has a CVSS 3.1 base score of 7.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refpacketstormsecurity.com/files/155498/Bash-5.0-Patch-11-Privilege-Escalation.htmlGitHubgithub.com/bminor/bash/commit/951bdaad7a18cc0dc1036bba86b18b90874d39ffReflists.apache.org/thread.html/rf9fa47ab66495c78bb4120b0754dd9531ca2ff0430f6685ac9b07772%40%3Cdev.mina.apache.org%3ERefsecurity.gentoo.org/glsa/202105-34Refsecurity.netapp.com/advisory/ntap-20200430-0003/Refwww.oracle.com/security-alerts/cpuapr2022.htmlRefwww.youtube.com/watch?v=-wGtxJ8opa8Refpacketstormsecurity.com/files/155498/Bash-5.0-Patch-11-Privilege-Escalation.htmlGitHubgithub.com/bminor/bash/commit/951bdaad7a18cc0dc1036bba86b18b90874d39ffReflists.apache.org/thread.html/rf9fa47ab66495c78bb4120b0754dd9531ca2ff0430f6685ac9b07772%40%3Cdev.mina.apache.org%3E

How CyberStrike helps

Frequently asked questions

What is CVE-2019-18276?

CVE-2019-18276 is a high-severity vulnerability. It was published on November 28, 2019 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2019-18276?

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2019-18276?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2019-18276?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2019-18276 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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