CVE-2019-18276: Software Security Vulnerability Vulnerability

HIGH
Advisory Identifier: GHSA-jcxc-5f87-vq5m
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CVSS 7.8
CWE-273
Published
Advisory Summary

CVE-2019-18276 is a HIGH (CVSS 7.8) security vulnerability vulnerability (CWE-273: Improper Check for Dropped Privileges) affecting Software libraries in the Maven ecosystem. The weakness occurs when the product attempts to drop privileges but does not check or incorrectly checks to see if the drop succeeded.. Remediation is available in the latest vendor maintenance releases.

CVE-2019-18276 at a Glance

CVE Identifier CVE-2019-18276
GHSA Identifier GHSA-jcxc-5f87-vq5m
Severity HIGH
CVSS v3.1 Base Score 7.8
CWE Classification CWE-273: Improper Check for Dropped Privileges
Affected Product Software
Package Ecosystem Maven
Published Date
Last Updated

Security Impact

CVSS: 7.8

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H).

Attack Vector Local (AV:L)
Attack Complexity Low (AC:L)
Privileges Required Low (PR:L)
User Interaction None (UI:N)
Scope Unchanged (S:U)
Confidentiality High (C:H)
Integrity High (I:H)
Availability High (A:H)

How to Fix CVE-2019-18276

To remediate this vulnerability, upgrade all affected Software dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

mvn dependency:tree

How to Check if You Are Affected

To determine whether your Java application is affected by CVE-2019-18276, inspect your build dependencies using the Maven Dependency Plugin:

mvn dependency:tree

Analyze the terminal output to locate any version of Software in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than the patched release), your application is affected.

Note: The mvn dependency:tree command inspects the resolved dependency graph declared in your project's POM files; it does not perform automated security scanning or inspect runtime dynamic classpaths. Always verify runtime container classpaths and shaded JARs.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-273: Improper Check for Dropped Privileges, where the product attempts to drop privileges but does not check or incorrectly checks to see if the drop succeeded. In Software, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

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.

References

NVD — CVE-2019-18276 NVD
https://nvd.nist.gov/vuln/detail/CVE-2019-18276
Security Fix Commit FIX COMMIT
https://github.com/bminor/bash/commit/951bdaad7a18cc0dc1036bba86b18b90874d39ff
cert-portal.siemens.com/productcert/html/ss... WEB
https://cert-portal.siemens.com/productcert/html/ssa-398330.html
lists.apache.org/thread.html/rf9fa47... WEB
https://lists.apache.org/thread.html/rf9fa47ab66495c78bb4120b0754dd9531ca2ff0430f6685ac9b07772%40%3Cdev.mina.apache.org%3E
lists.apache.org/thread.html/rf9fa47... WEB
https://lists.apache.org/thread.html/rf9fa47ab66495c78bb4120b0754dd9531ca2ff0430f6685ac9b07772@%3Cdev.mina.apache.org%3E
Software Security Information SECURITY
https://security.gentoo.org/glsa/202105-34
Software Security Information SECURITY
https://security.netapp.com/advisory/ntap-20200430-0003
Software Security Information SECURITY
https://www.oracle.com/security-alerts/cpuapr2022.html
www.youtube.com/watch WEB
https://www.youtube.com/watch?v=-wGtxJ8opa8
Software Security Information SECURITY
http://packetstormsecurity.com/files/155498/Bash-5.0-Patch-11-Privilege-Escalation.html

Frequently Asked Questions

What is CVE-2019-18276?
CVE-2019-18276 is a security vulnerability in Software classified as a security vulnerability vulnerability under CWE-273: Improper Check for Dropped Privileges.
Which Software versions are affected?
Affected versions include releases prior to current release patches.
What version fixes CVE-2019-18276?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
What is the CVSS score of CVE-2019-18276?
CVE-2019-18276 has a CVSS v3.1 base score of 7.8 (HIGH) with vector string CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
What CWE is associated with CVE-2019-18276?
CVE-2019-18276 is classified under CWE-273: Improper Check for Dropped Privileges (The product attempts to drop privileges but does not check or incorrectly checks to see if the drop succeeded.).
How can I check Maven dependencies for CVE-2019-18276?
Run the dependency tree command: 'mvn dependency:tree'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
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  "id" : "GHSA-jcxc-5f87-vq5m",
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  "aliases" : [ "CVE-2019-18276" ],
  "details" : "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.",
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