Red Hat Security Advisory: multicluster engine for Kubernetes v2.6.12 security update

Important

A flaw was found in the `net` package of Go (golang), specifically when using the `LookupCNAME` function with the `cgo` DNS resolver. A remote attacker could exploit this by providing a very long Canonical Name (CNAME) response. This can trigger a double-free of C memory, leading to a crash and a Denial of Service (DoS) for the affected application.

CWE-1341 - Multiple Releases of Same Resource or Handle

A flaw was found in golang.org/x/net/idna. ToASCII and ToUnicode incorrectly accept Punycode-encoded labels that decode to an ASCII-only hostname (for example, xn--example-.com returns example.com instead of an error). Applications that validate the ASCII form then convert to Unicode may grant access to a restricted hostname the ASCII check would have rejected.

CWE-1289 - Improper Validation of Unsafe Equivalence in Input

A flaw was found in golang.org/x/crypto/ssh. A remote attacker could exploit this vulnerability when an SSH server authentication callback returned a PartialSuccessError with non-nil permissions. This flaw caused these permissions to be silently discarded, potentially bypassing certificate restrictions, such as a force-command, after a second authentication factor succeeded. This could lead to unauthorized command execution or access.

CWE-281 - Improper Preservation of Permissions

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 Axios, a promise-based HTTP client, specifically in its Node.js HTTP adapter. When Axios is configured to use an authenticated proxy and follows a redirect, it may inadvertently send the Proxy-Authorization header, containing proxy credentials, to the redirect target. This can lead to the disclosure of sensitive proxy credentials to an unintended remote server.

CWE-201 - Insertion of Sensitive Information Into Sent Data

A flaw was found in Axios. During specific proxy-to-direct redirect flows in the Node.js HTTP adapter, a remote attacker could exploit this vulnerability. The Proxy-Authorization header, which contains proxy credentials and is intended only for the outbound proxy, may be forwarded to the final redirected origin. This can lead to the disclosure of sensitive proxy credentials to an unintended third party.

CWE-201 - Insertion of Sensitive Information Into Sent Data

A flaw was found in Axios, a promise-based HTTP client. When using the fetch adapter, Axios did not properly enforce configured request and response size limits. This vulnerability allows a remote attacker, through a malicious or compromised server, or by supplying a large data URL, to send or receive oversized data bodies. This can lead to resource exhaustion in server-side applications, resulting in a Denial of Service (DoS).

CWE-770 - Allocation of Resources Without Limits or Throttling

A flaw was found in Axios, a promise-based HTTP client. This vulnerability occurs because Axios does not properly normalize IPv4-mapped IPv6 addresses. When a NO_PROXY setting is configured to block direct access to specific IPv4 addresses, an attacker can bypass this restriction by using the IPv4-mapped IPv6 form of the address in a request URL. This allows the request to be routed through the proxy, potentially exposing internal services or sensitive information that should otherwise be inaccessible.

CWE-289 - Authentication Bypass by Alternate Name