CVE-2004-2022 in Activeperl
Summary
by MITRE
ActivePerl 5.8.x and others, and Larry Wall s Perl 5.6.1 and others, when running on Windows systems, allows attackers to cause a denial of service (crash) and possibly execute arbitrary code via a long argument to the system command, which leads to a stack-based buffer overflow. NOTE: it is unclear whether this bug is in Perl or the OS API that is used by Perl.
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Analysis
by VulDB Data Team • 07/05/2025
This vulnerability represents a critical stack-based buffer overflow flaw affecting multiple versions of perl including ActivePerl 5.8.x series and standard Perl 5.6.1 across Windows operating systems. The vulnerability specifically manifests when the system command receives an excessively long argument string, creating conditions that allow attackers to manipulate memory layout and potentially execute arbitrary code. The flaw stems from inadequate input validation within perl's implementation of the system command, which directly interfaces with underlying windows operating system APIs. This creates a dangerous scenario where malformed input can overwrite adjacent memory locations, leading to unpredictable behavior including application crashes or complete system compromise.
The technical exploitation of this vulnerability aligns with common software security patterns documented in CWE-121, which describes stack-based buffer overflow conditions where insufficient bounds checking allows attackers to overwrite stack data. The attack vector specifically targets the system command implementation in perl, which serves as a bridge between interpreted perl code and native windows system calls. When perl processes a command string that exceeds allocated buffer boundaries, the overflow can corrupt return addresses, function pointers, and other critical stack metadata. This vulnerability operates at the intersection of application-level scripting and system-level memory management, making it particularly dangerous as it can be triggered through normal perl script execution without requiring specialized privileges.
The operational impact of this vulnerability extends beyond simple denial of service to include potential code execution capabilities that could allow attackers to escalate privileges and compromise entire systems. Attackers can craft malicious perl scripts containing overly long argument strings that trigger the buffer overflow during system command execution, potentially leading to complete system compromise. The vulnerability affects both ActivePerl and standard perl distributions, indicating it's a fundamental flaw in perl's Windows implementation rather than a distribution-specific issue. This widespread impact makes the vulnerability particularly concerning for organizations running perl-based applications on windows platforms, especially in server environments where perl scripts might process untrusted input from external sources.
Mitigation strategies for this vulnerability should focus on immediate patching of affected perl installations, implementing input validation controls within perl scripts, and applying system-level protections such as stack canaries and address space layout randomization. Organizations should also consider restricting perl script execution privileges and implementing proper input sanitization for any external data processing. The vulnerability highlights the importance of proper bounds checking in system API interactions and demonstrates how scripting languages can inadvertently expose underlying operating system vulnerabilities through their implementation of standard functions. Security monitoring should include detection of unusually long argument strings passed to system commands, as this pattern can indicate exploitation attempts. Given the nature of the vulnerability and its potential for privilege escalation, comprehensive security audits of perl-based systems should be conducted to identify and remediate similar implementation flaws across all affected software components.