{"id":34380,"date":"2025-05-04T08:59:54","date_gmt":"2025-05-04T08:59:54","guid":{"rendered":""},"modified":"2025-09-08T17:18:55","modified_gmt":"2025-09-08T23:18:55","slug":"cve-2023-47039-perl-path-search-order-vulnerability-on-windows-systems","status":"publish","type":"post","link":"https:\/\/www.ameeba.com\/blog\/cve-2023-47039-perl-path-search-order-vulnerability-on-windows-systems\/","title":{"rendered":"CVE-2023-47039: Perl Path Search Order Vulnerability on Windows Systems<\/strong>"},"content":{"rendered":"

Overview<\/strong><\/p>\n

A significant security vulnerability, CVE-2023-47039, has been discovered in the Windows implementation of Perl, a widely-used general-purpose scripting language. This vulnerability poses a severe threat to both individual users and organizations that leverage Perl on Windows systems. The issue arises from the way Perl on Windows attempts to find and execute<\/a> the shell, `cmd.exe`, with a preference for the current working directory. This behavior can lead to the execution of malicious code<\/a>, potentially compromising the entire system or leaking sensitive data.<\/p>\n

Vulnerability Summary<\/strong><\/p>\n

CVE ID: CVE-2023-47039
\nSeverity: High (7.8 CVSS Score)
\nAttack Vector: Local
\nPrivileges Required: Low
\nUser Interaction: Required
\nImpact: Potential system<\/a> compromise or data leakage<\/p>\n

Affected Products<\/strong><\/p>\n

Product | Affected Versions<\/p>\n

Perl on Windows | All versions prior<\/a> to the latest patch<\/p>\n

How the Exploit Works<\/strong><\/p>\n

The exploit works by taking advantage of Perl’s default behavior on Windows systems<\/a>. When running an executable that uses the Perl interpreter, Perl attempts to find and execute `cmd.exe` within the operating system<\/a>. However, instead of looking for `cmd.exe` in its typical location, Perl first looks in the current working directory. This behavior allows an attacker to place a malicious<\/a> `cmd.exe` in a directory with weak permissions, such as `C:ProgramData`. When an administrator attempts to use the executable from this compromised location, the malicious code is executed<\/a> instead.<\/p>\n

Conceptual Example Code<\/strong><\/p>\n

Keeping in mind that this is a local attack vector and requires some level of user<\/a> interaction, an example of how this vulnerability might be exploited is as follows:<\/p>\n

REM Create a malicious cmd.exe in a directory with weak permissions\ncopy C:\\path\\to\\malicious\\cmd.exe C:\\ProgramData\\\nREM Run a Perl script that will unknowingly use the malicious cmd.exe\nperl C:\\path\\to\\perl\\script.pl<\/code><\/pre>\n
The Perl interpreter will attempt to find `cmd.exe` to execute the script, and due to the path search<\/a> order issue, it will find and execute the malicious `cmd.exe` in `C:ProgramData` before it finds the legitimate version. This can lead to arbitrary code execution, potentially compromising the system or leading<\/a> to data leakage.
\nTo mitigate this vulnerability, apply the latest vendor patch or use a Web Application Firewall (WAF) or Intrusion Detection System (IDS) as temporary mitigation. However, the most effective solution is to update the affected systems with the latest<\/a> patches from the Perl project.<\/p>\n","protected":false},"excerpt":{"rendered":"
Overview A significant security vulnerability, CVE-2023-47039, has been discovered in the Windows implementation of Perl, a widely-used general-purpose scripting language. This vulnerability poses a severe threat to both individual users and organizations that leverage Perl on Windows systems. The issue arises from the way Perl on Windows attempts to find and execute the shell, `cmd.exe`, […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"om_disable_all_campaigns":false,"_monsterinsights_skip_tracking":false,"footnotes":""},"categories":[1],"tags":[],"vendor":[82],"product":[],"attack_vector":[80],"asset_type":[],"severity":[],"exploit_status":[],"class_list":["post-34380","post","type-post","status-publish","format-standard","hentry","category-uncategorized","vendor-microsoft","attack_vector-rce"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t