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    CVE-2009-4018

    The proc_open function in ext/standard/proc_open.c in PHP before 5.2.11 and 5.3.x before 5.3.1 does not enforce the (1) safe_mode_allowed_env_vars and (2) safe_mode_protected_env_vars directives, which allows context-dependent attackers to execute programs with an arbitrary environment via the env parameter, as demonstrated by a crafted value of the LD_LIBRARY_PATH environment variable.

    Published:Jul 23, 2009
    Last Modified:Apr 23, 2026
    EPS:Nov 27, 2009
    EPSS Score:0.22311
    CVSS Score:7.5

    Affected Products

    Vendor
    Php
    Product
    Php

    Exploits

    http://bugs.php.net/bug.php?id=49026http://bugs.php.net/bug.php?id=49026https://www.exploit-db.com/exploits/11636

    Common Weakness Enumeration

    No CWE recorded yet

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

    Related CVEs

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    CVE-2026-7258 (CVSS 6.3) — In PHP versions 8.2.* before 8.2.31, 8.3.* before 8.3.31, 8.4.* before 8.4.21, and 8.5.* before 8.5.6, some fu…
    CVE-2026-6722 (CVSS 9.5) — In PHP versions 8.2.* before 8.2.31, 8.3.* before 8.3.31, 8.4.* before 8.4.21, and 8.5.* before 8.5.6, the SOA…
    CVE-2026-7259 (CVSS 2.1) — In PHP versions 8.2.* before 8.2.31, 8.3.* before 8.3.31, 8.4.* before 8.4.21, and 8.5.* before 8.5.6, a misma…
    CVE-2026-7261 (CVSS 6.3) — In PHP versions 8.2.* before 8.2.31, 8.3.* before 8.3.31, 8.4.* before 8.4.21, and 8.5.* before 8.5.6, when So…
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    References

    http://bugs.php.net/bug.php?id=49026
    http://marc.info/?l=bugtraq&m=127680701405735&w=2
    http://marc.info/?l=oss-security&m=125886770008678&w=2
    http://marc.info/?l=oss-security&m=125897935330618&w=2
    http://secunia.com/advisories/40262
    http://secunia.com/advisories/41480
    http://secunia.com/advisories/41490
    http://svn.php.net/viewvc/?view=revision&revision=286360
    http://svn.php.net/viewvc/php/php-src/branches/PHP_5_2/ext/standard/proc_open.c?r1=286360&r2=286359&pathrev=286360
    http://svn.php.net/viewvc/php/php-src/branches/PHP_5_3/ext/standard/proc_open.c?r1=286360&r2=286359&pathrev=286360
    http://www.itrc.hp.com/service/cki/docDisplay.do?docId=emr_na-c02512995
    http://www.mandriva.com/security/advisories?name=MDVSA-2009:303
    http://www.openwall.com/lists/oss-security/2009/11/23/15
    http://www.php.net/ChangeLog-5.php
    http://www.securityfocus.com/bid/37138
    https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A7256
    http://bugs.php.net/bug.php?id=49026
    http://marc.info/?l=bugtraq&m=127680701405735&w=2
    http://marc.info/?l=oss-security&m=125886770008678&w=2
    http://marc.info/?l=oss-security&m=125897935330618&w=2
    http://secunia.com/advisories/40262
    http://secunia.com/advisories/41480
    http://secunia.com/advisories/41490
    http://svn.php.net/viewvc/?view=revision&revision=286360
    http://svn.php.net/viewvc/php/php-src/branches/PHP_5_2/ext/standard/proc_open.c?r1=286360&r2=286359&pathrev=286360
    http://svn.php.net/viewvc/php/php-src/branches/PHP_5_3/ext/standard/proc_open.c?r1=286360&r2=286359&pathrev=286360
    http://www.itrc.hp.com/service/cki/docDisplay.do?docId=emr_na-c02512995
    http://www.mandriva.com/security/advisories?name=MDVSA-2009:303
    http://www.openwall.com/lists/oss-security/2009/11/23/15
    http://www.php.net/ChangeLog-5.php
    http://www.securityfocus.com/bid/37138
    https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A7256

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High