A vulnerability was found in Undertow. This vulnerability impacts a server that supports the wildfly-http-client protocol. Whenever a malicious user opens and closes a connection with the HTTP port of the server and then closes the connection immediately, the server will end with both memory and open file limits exhausted at some point, depending on the amount of memory available. At HTTP upgrade to remoting, the WriteTimeoutStreamSinkConduit leaks connections if RemotingConnection is closed by Remoting ServerConnectionOpenListener. Because the remoting connection originates in Undertow as part of the HTTP upgrade, there is an external layer to the remoting connection. This connection is unaware of the outermost layer when closing the connection during the connection opening procedure. Hence, the Undertow WriteTimeoutStreamSinkConduit is not notified of the closed connection in this scenario. Because WriteTimeoutStreamSinkConduit creates a timeout task, the whole dependency tree leaks via that task, which is added to XNIO WorkerThread. So, the workerThread points to the Undertow conduit, which contains the connections and causes the leak.

The remote Redhat Enterprise Linux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2024:1861 advisory.

  - keycloak: Log Injection during WebAuthn authentication or registration (CVE-2023-6484)

  - keycloak: Authorization Bypass (CVE-2023-6544)

  - keycloak: path transversal in redirection validation (CVE-2024-1132)

  - keycloak: org.keycloak.protocol.oidc: unvalidated cross-origin messages in checkLoginIframe leads to DDoS     (CVE-2024-1249)

  - undertow: Out-of-memory Error after several closed connections with wildfly-http-client protocol     (CVE-2024-1635)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Redhat Enterprise Linux 7 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2024:1860 advisory.

  - keycloak: Log Injection during WebAuthn authentication or registration (CVE-2023-6484)

  - keycloak: Authorization Bypass (CVE-2023-6544)

  - keycloak: path transversal in redirection validation (CVE-2024-1132)

  - keycloak: org.keycloak.protocol.oidc: unvalidated cross-origin messages in checkLoginIframe leads to DDoS     (CVE-2024-1249)

  - undertow: Out-of-memory Error after several closed connections with wildfly-http-client protocol     (CVE-2024-1635)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Redhat Enterprise Linux 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2024:1862 advisory.

  - keycloak: Log Injection during WebAuthn authentication or registration (CVE-2023-6484)

  - keycloak: Authorization Bypass (CVE-2023-6544)

  - keycloak: path transversal in redirection validation (CVE-2024-1132)

  - keycloak: org.keycloak.protocol.oidc: unvalidated cross-origin messages in checkLoginIframe leads to DDoS     (CVE-2024-1249)

  - undertow: Out-of-memory Error after several closed connections with wildfly-http-client protocol     (CVE-2024-1635)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Redhat Enterprise Linux 7 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2024:1674 advisory.

  - undertow: unrestricted request storage leads to memory exhaustion (CVE-2023-1973)

  - undertow: Cookie Smuggling/Spoofing (CVE-2023-4639)

  - ssh: Prefix truncation attack on Binary Packet Protocol (BPP) (CVE-2023-48795)

  - undertow: Out-of-memory Error after several closed connections with wildfly-http-client protocol     (CVE-2024-1635)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Redhat Enterprise Linux 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2024:1676 advisory.

  - undertow: unrestricted request storage leads to memory exhaustion (CVE-2023-1973)

  - undertow: Cookie Smuggling/Spoofing (CVE-2023-4639)

  - ssh: Prefix truncation attack on Binary Packet Protocol (BPP) (CVE-2023-48795)

  - undertow: Out-of-memory Error after several closed connections with wildfly-http-client protocol     (CVE-2024-1635)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Redhat Enterprise Linux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2024:1675 advisory.

  - undertow: unrestricted request storage leads to memory exhaustion (CVE-2023-1973)

  - undertow: Cookie Smuggling/Spoofing (CVE-2023-4639)

  - ssh: Prefix truncation attack on Binary Packet Protocol (BPP) (CVE-2023-48795)

  - undertow: Out-of-memory Error after several closed connections with wildfly-http-client protocol     (CVE-2024-1635)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

ID	Name	Product	Family	Severity
193410	RHEL 8 : Red Hat Single Sign-On 7.6.8 security update on RHEL 8 (Important) (RHSA-2024:1861)	Nessus	Red Hat Local Security Checks	high
193409	RHEL 7 : Red Hat Single Sign-On 7.6.8 and security update on RHEL 7 (Important) (RHSA-2024:1860)	Nessus	Red Hat Local Security Checks	high
193408	RHEL 9 : Red Hat Single Sign-On 7.6.8 security update on RHEL 9 (Important) (RHSA-2024:1862)	Nessus	Red Hat Local Security Checks	high
192931	RHEL 7 : Red Hat JBoss Enterprise Application Platform 7.4.16 Security update (Important) (RHSA-2024:1674)	Nessus	Red Hat Local Security Checks	medium
192930	RHEL 9 : Red Hat JBoss Enterprise Application Platform 7.4.16 Security update (Important) (RHSA-2024:1676)	Nessus	Red Hat Local Security Checks	medium
192929	RHEL 8 : Red Hat JBoss Enterprise Application Platform 7.4.16 Security update (Important) (RHSA-2024:1675)	Nessus	Red Hat Local Security Checks	medium

Detections

Analytics

CVE-2024-1635

high

Tenable Plugins

high

high

high

medium

medium

medium