Email content disclosure in PHP



Risk Low
Patch available YES
Number of vulnerabilities 1
CVE-ID N/A
CWE-ID CWE-200
Exploitation vector Local
Public exploit N/A
Vulnerable software
 PHP
Universal components / Libraries / Scripting languages

Vendor PHP Group

Security Bulletin

This security bulletin contains one low risk vulnerability.

1) Information disclosure

EUVDB-ID: #VU6975

Risk: Low

CVSSv4.0: 0.5 [CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: N/A

CWE-ID: CWE-200 - Information exposure

Exploit availability: No

Description

The vulnerability allows an attacker to gain access to potentially sensitive information.

The vulnerability exists within the implementation of the mail() PHP function in win32/sendmail.c, when parsing email headers for CC and BCC lines. A local or remote attacker with ability to modify email headers can send a copy of email messages to arbitrary email address.

Example: 

$headers = implode("\r\n", [
  "Cc: test2@example.com",
  "X-Test-Cc: line 2",
  "X-Test-Aabbcc: test3@example.com",
  "X-Line-4: line 4"
]);
mail("test@example.com", "Subject", "Body", $headers);

Actual recipients: 

Recipients: test@example.com, test2@example.com, test3@example.com

Mitigation

Update to version 7.0.20 or 7.1.6.

Vulnerable software versions

PHP: 7.0.0 - 7.1.4

CPE2.3 External links

https://bugs.php.net/bug.php?id=74510
https://git.php.net/?p=php-src.git;a=commit;h=20a608d9dae4c758bf608e10fd2cdb9cc1559625


Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.



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