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[HttpFoundation] Fixed IpUtils::anonymize exception when using IPv6 link-local addresses with RFC4007 scoping #59055

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Merged
merged 1 commit into from
Jan 7, 2025
Merged

[HttpFoundation] Fixed IpUtils::anonymize exception when using IPv6 link-local addresses with RFC4007 scoping #59055

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10 changes: 10 additions & 0 deletions src/Symfony/Component/HttpFoundation/IpUtils.php
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Original file line number Diff line number Diff line change
Expand Up @@ -182,6 +182,16 @@ public static function checkIp6(string $requestIp, string $ip): bool
*/
public static function anonymize(string $ip): string
{
/**
* If the IP contains a % symbol, then it is a local-link address with scoping according to RFC 4007
* In that case, we only care about the part before the % symbol, as the following functions, can only work with
* the IP address itself. As the scope can leak information (containing interface name), we do not want to
* include it in our anonymized IP data.
*/
if (str_contains($ip, '%')) {
$ip = substr($ip, 0, strpos($ip, '%'));
}

$wrappedIPv6 = false;
if (str_starts_with($ip, '[') && str_ends_with($ip, ']')) {
$wrappedIPv6 = true;
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1 change: 1 addition & 0 deletions src/Symfony/Component/HttpFoundation/Tests/IpUtilsTest.php
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Expand Up @@ -147,6 +147,7 @@ public static function anonymizedIpData()
['[2a01:198::3]', '[2a01:198::]'],
['::ffff:123.234.235.236', '::ffff:123.234.235.0'], // IPv4-mapped IPv6 addresses
['::123.234.235.236', '::123.234.235.0'], // deprecated IPv4-compatible IPv6 address
['fe80::1fc4:15d8:78db:2319%enp4s0', 'fe80::'], // IPv6 link-local with RFC4007 scoping
];
}

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