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CVE-2011-4116 represents a classic security vulnerability residing within the File::Temp module and file handling mechanisms of the Perl ecosystem, specifically involving improper link resolution before file access.
When software applications generate temporary files or directories, they depend on validation routines like `_is_safe` to guarantee that target directories are secure from local manipulation.
In vulnerable historical versions, these validation routines failed to securely handle symbolic links, creating a critical window for time-of-check to time-of-use (TOCTOU) race conditions.
A malicious local user could exploit this logic flaw by substituting a predicted temporary path with a carefully crafted symbolic link pointing to sensitive system files.
Because file verification and file creation lacked atomic execution guarantees, the affected process could be deceived into interacting with files outside its secure sandbox directory.
Such flaws could potentially enable unauthorized local file modification or indirect privilege escalation vectors depending on how application workflows handled temporary assets.
Security auditing utilities like `cpan-audit` help administrators identify these and other known vulnerabilities across installed CPAN distributions and project dependencies.
Recent updates to `cpan-audit` reflect continuous architectural improvements, such as migrating database support to `CPANSA::DB` and updating default version comparison rules.
These enhancements ensure that security scans execute with higher precision, reducing ambiguity when evaluating version ranges in modern continuous integration pipelines.
Remediating such issues requires updating affected core libraries, adopting strict file creation permissions, and utilizing modern auditing toolchains to maintain secure deployments.
DailyCVE Form:
Platform: Perl
Version: Legacy
Vulnerability: Symlink issue
Severity: Low
date: 2011-11-04
Prediction: Patched
What Undercode Say
Bash Commands and Codes
Install cpan-audit and check installed modules excluding specific CVEs cpanm CPAN::Audit cpan-audit installed --exclude CVE-2011-4116 Run audit on current project dependencies cpan-audit deps . Check database freshness and use strict version comparisons cpan-audit --fresh
Exploit: (Educational Purposes!)
Conceptual PoC demonstrating symlink creation for race condition analysis
use File::Temp qw(tempdir);
my $dir = tempdir( CLEANUP => 1 );
print "Temporary directory created safely at: $dir\n";
An attacker attempts to link a target file before validation completes
symlink('/etc/passwd', "$dir/malicious_link");
Protection: from this CVE
To protect systems against vulnerabilities like CVE-2011-4116 and related file handling flaws, developers must upgrade Perl core modules and dependencies to their latest patched releases. Utilizing modern software composition analysis tools such as `cpan-audit` integrated with `CPANSA::DB` ensures continuous visibility into known security advisories. Furthermore, implementing strict file permission masks (umask) and avoiding predictable temporary file paths helps mitigate local race conditions.
Impact:
The impact of CVE-2011-4116 is generally rated as low severity because it requires local system access and specific timing windows to exploit. However, successful exploitation can lead to unauthorized file overwrites or unintended file access depending on the privileges of the running process and the targeted system resources.
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Sources:
Reported By: github.com
Extra Source Hub:
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