Red Hat Security Advisory: multicluster engine for Kubernetes v2.8.8 security update

Important

A flaw was found in the SSH Agent servers component (golang.org/x/crypto/ssh/agent). This vulnerability allows a remote attacker to cause a denial of service (DoS) by sending a specially crafted, malformed message during new identity requests. The server fails to validate the size of these messages, leading to an out-of-bounds read that can cause the program to panic and terminate.

CWE-125 - Out-of-bounds Read

A flaw was found in the archive/tar package in the Go standard library. tar.Reader does not set a maximum size on the number of sparse region data blocks in GNU tar pax 1.0 sparse files. A specially crafted tar archive with a pax header indicating a big number of sparse regions can cause a Go program to try to allocate a large amount of memory, causing an out-of-memory condition and resulting in a denial of service.

CWE-770 - Allocation of Resources Without Limits or Throttling

A flaw was found in BuildKit, a toolkit for converting source code to build artifacts. An untrusted BuildKit frontend can be leveraged to craft a malicious API message, allowing files to be written outside of the designated BuildKit state directory. This vulnerability, which is a form of arbitrary file write, could enable an attacker to execute unauthorized code or escalate their privileges on the system. This issue arises when custom BuildKit frontends are used with specific configuration options.

CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

A flaw was found in BuildKit. Insufficient validation of Git URL fragment subdirectory components may allow a remote attacker to access files outside the checked-out Git repository root. This access is limited to files on the same mounted filesystem. This vulnerability could lead to unauthorized information disclosure.

CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

A flaw was found in Go JOSE, a library for handling JSON Web Encryption (JWE) objects. A remote attacker could exploit this vulnerability by providing a specially crafted JWE object. When decrypting such an object, if a key wrapping algorithm is specified but the encrypted key field is empty, the application can crash. This leads to a denial of service (DoS), making the affected service unavailable to legitimate users.

CWE-131 - Incorrect Calculation of Buffer Size

A flaw was found in Helm, a package manager for Kubernetes. A remote attacker could exploit this vulnerability by providing a specially crafted Chart to the `helm pull --untar` command. This would cause the Chart's contents to be written to an unintended directory, potentially overwriting existing files or placing malicious files in an accessible location, leading to data integrity and availability issues.

CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

A flaw was found in the `idna` package, specifically within the `golang.org/x/net/idna` component. This vulnerability allows for privilege escalation due to incorrect processing of Punycode-encoded labels. An attacker could craft a malicious Punycode label that, when initially checked, appears safe but then decodes to a restricted ASCII hostname, bypassing security controls and gaining unauthorized access.

CWE-1289 - Improper Validation of Unsafe Equivalence 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