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Security Advisories: MDE2OlNlY3VyaXR5QWR2aXNvcnlHSFNBLTdxNDQtcjI1eC13bTRx
Remote Code Execution vulnerability in PHPMailer 6.4.1 running on Windows
PHPMailer 6.4.1 contains a possible remote code execution vulnerability through the $lang_path
parameter of the setLanguage()
method. If the $lang_path
parameter is passed unfiltered from user input, it can be set to a UNC path, and if an attacker is also able to create a remote mount on the server that the UNC path points to, a script file under their control may be executed.
Impact
Arbitrary code may be run by a remote attacker under the web server or PHP process running on Window hosts.
Patches
Mitigated in PHPMailer 6.5.0 by no longer treating translation files as PHP code, but by parsing their text content directly.
This approach avoids the possibility of executing unknown code while retaining backward compatibility. This isn't ideal, so the current translation format is deprecated and will be replaced in the next major release.
Workarounds
Any of:
- Ensure that calling code does not pass unfiltered user-supplied data to the
$lang_path
parameter of thesetLanguage()
method. - Block or filter the use of unknown UNC paths in this parameter (or altogether).
- Ensure that unauthorised users do not have the ability to read from unknown remote servers via UNC paths.
- Run on an OS that does not support UNC paths
References
Reported by listensec.com via Tidelift.
For more information
If you have any questions or comments about this advisory:
- Open an issue in PHPMailer
- Email the maintainers
JSON: https://advisories.ecosyste.ms/api/v1/advisories/MDE2OlNlY3VyaXR5QWR2aXNvcnlHSFNBLTdxNDQtcjI1eC13bTRx
Source: GitHub Advisory Database
Origin: Unspecified
Severity: High
Classification: General
Published: almost 3 years ago
Updated: 3 months ago
CVSS Score: 8.1
CVSS vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Identifiers: GHSA-7q44-r25x-wm4q, CVE-2021-34551
References:
- https://github.com/PHPMailer/PHPMailer/security/advisories/GHSA-7q44-r25x-wm4q
- https://nvd.nist.gov/vuln/detail/CVE-2021-34551
- https://github.com/PHPMailer/PHPMailer/commit/acd264bf17ff4ac5c915f0d4226dce8a9ea70bc3
- https://github.com/PHPMailer/PHPMailer/blob/master/SECURITY.md
- https://lists.fedoraproject.org/archives/list/[email protected]/message/3YRMWGA4VTMXFB22KICMB7YMFZNFV3EJ/
- https://lists.fedoraproject.org/archives/list/[email protected]/message/FJYSOFCUBS67J3TKR74SD3C454N7VTYM/
- https://github.com/FriendsOfPHP/security-advisories/blob/master/phpmailer/phpmailer/CVE-2021-34551.yaml
- https://github.com/PHPMailer/PHPMailer/releases/tag/v6.5.0
- https://github.com/advisories/GHSA-7q44-r25x-wm4q
Blast Radius: 34.7
Affected Packages
packagist:phpmailer/phpmailer
Dependent packages: 1,199Dependent repositories: 19,318
Downloads: 61,274,179 total
Affected Version Ranges: < 6.5.0
Fixed in: 6.5.0
All affected versions: 5.2.2, 5.2.4, 5.2.5, 5.2.6, 5.2.7, 5.2.8, 5.2.9, 5.2.10, 5.2.11, 5.2.12, 5.2.13, 5.2.14, 5.2.15, 5.2.16, 5.2.17, 5.2.18, 5.2.19, 5.2.20, 5.2.21, 5.2.22, 5.2.23, 5.2.24, 5.2.25, 5.2.26, 5.2.27, 5.2.28, 6.0.0, 6.0.1, 6.0.2, 6.0.3, 6.0.4, 6.0.5, 6.0.6, 6.0.7, 6.1.0, 6.1.1, 6.1.2, 6.1.3, 6.1.4, 6.1.5, 6.1.6, 6.1.7, 6.1.8, 6.2.0, 6.3.0, 6.4.0, 6.4.1
All unaffected versions: 6.5.0, 6.5.1, 6.5.2, 6.5.3, 6.5.4, 6.6.0, 6.6.1, 6.6.2, 6.6.3, 6.6.4, 6.6.5, 6.7.1, 6.8.0, 6.8.1, 6.9.0, 6.9.1