SB2017060802 - Email content disclosure in PHP
Published: June 8, 2017
Security Bulletin ID
SB2017060802
Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Information disclosure
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 security vulnerability.
1) Information disclosure (CVE-ID: N/A)
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
Remediation
Install update from vendor's website.