Red Hat Security Advisory: multicluster engine for Kubernetes v2.10.5 security update

Important

A flaw was found in the net/http package of the Golang standard library. The HTTP client drops sensitive headers after following a cross-domain redirect. For example, a request to `a.com/` containing an Authorization header redirected to `b.com/` will not send that header to `b.com`. However, the sensitive headers would be restored if the client received a subsequent same-domain redirect. For example, a chain of redirects from `a.com/`, to `b.com/1`, and finally to `b.com/2` would incorrectly send the Authorization header to `b.com/2`.

CWE-200 - Exposure of Sensitive Information to an Unauthorized Actor

A flaw was found in the Golang crypto/internal/nistec package. Due to the usage of a variable time instruction in the assembly implementation of an internal function, a small number of bits of secret scalars are leaked on the ppc64le architecture. Considering how this function is used, this leakage is likely insufficient to recover the private key when P-256 is used in any well-known protocols.

CWE-200 - Exposure of Sensitive Information to an Unauthorized Actor

A flaw was found in the `crypto/x509` package of `golang`. This vulnerability allows a remote attacker to cause a Denial of Service (DoS) by presenting a specially crafted X.509 certificate with a large number of DNS Subject Alternative Name (SAN) entries. The certificate verification process, specifically the `VerifyHostname` function, incurs excessive computational overhead due to repeated string operations when processing these entries. This can lead to a significant performance degradation or unresponsiveness of systems validating such certificates.

CWE-606 - Unchecked Input for Loop Condition

A flaw was found in golang.org/x/crypto/ssh. The RSA and DSA public key parsers in the affected component did not enforce size limits on key parameters. This vulnerability allows an unauthenticated client to provide a crafted public key with an excessively large modulus or DSA parameter during public key authentication. Successful exploitation could lead to a denial of service (DoS) due to prolonged CPU consumption during signature verification.

CWE-1284 - Improper Validation of Specified Quantity in Input

A flaw was found in golang.org/x/crypto/ssh. The Verify() method, responsible for FIDO/U2F security key types, did not properly check for user presence. This allowed signatures to be accepted without requiring a physical touch on the hardware security key. As a result, an attacker could potentially use a hardware security key in an unattended manner, bypassing a critical security control designed to ensure user intent.

CWE-347 - Improper Verification of Cryptographic Signature

A flaw was found in golang.org/x/crypto/ssh. A remote attacker could send specially crafted inputs to the AES-GCM packet decoder. This could lead to an incorrectly placed cast from bytes to an integer, causing a server-side panic and resulting in a Denial of Service (DoS) for the affected system.

CWE-681 - Incorrect Conversion between Numeric Types

A flaw was found in the console component. An attacker who can write to container logs on a managed cluster can inject malicious code into the hub console user's browser session. This occurs when the user views raw pod logs, as the console does not properly escape the log content. Successful exploitation could lead to session hijacking, credential theft, or unauthorized actions performed on behalf of the console user.

CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

A flaw was found in hypershift-addon-operator. A hub-cluster administrator with write access to the hypershift-operator-install-flags ConfigMap can inject malicious command-line arguments into the privileged install Job. This vulnerability, known as argument injection, allows the attacker to pull arbitrary container images and gain full administrative control (cluster-admin code execution) on managed spoke clusters.

CWE-88 - Improper Neutralization of Argument Delimiters in a Command ('Argument Injection')