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Make stricter IP format check in IpAddressMatcher #17500

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Merged
merged 1 commit into from
Jul 31, 2025
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Make stricter IP format check in IpAddressMatcher #17500

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3 changes: 2 additions & 1 deletion web/src/main/java/org/springframework/security/web/util/matcher/IpAddressMatcher.java
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Original file line number Diff line number Diff line change
Expand Up @@ -35,11 +35,12 @@
*
* @author Luke Taylor
* @author Steve Riesenberg
* @author Andrey Litvitski
* @since 3.0.2
*/
public final class IpAddressMatcher implements RequestMatcher {

private static Pattern IPV4 = Pattern.compile("\\d{0,3}.\\d{0,3}.\\d{0,3}.\\d{0,3}(/\\d{0,3})?");
private static Pattern IPV4 = Pattern.compile("^\\d{1,3}(?:\\.\\d{1,3}){0,3}(?:/\\d{1,2})?$");

private final InetAddress requiredAddress;

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9 changes: 9 additions & 0 deletions web/src/test/java/org/springframework/security/web/util/matcher/IpAddressMatcherTests.java
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Expand Up @@ -27,6 +27,7 @@

/**
* @author Luke Taylor
* @author Andrey Litvitski
*/
public class IpAddressMatcherTests {

Expand Down Expand Up @@ -167,4 +168,12 @@ public void toStringWhenOnlyIpIsProvidedThenReturnsIpAddressOnly() {
assertThat(matcher.toString()).hasToString("IpAddress [127.0.0.1]");
}

// gh-17499
@Test
public void constructorRejectsInvalidIpv4WithX() {
String badIp = "10x1x1x1";
assertThatIllegalArgumentException().isThrownBy(() -> new IpAddressMatcher(badIp))
.withMessage("ipAddress 10x1x1x1 doesn't look like an IP Address. Is it a host name?");
}

}