CVE-2022-41724

Large handshake records may cause panics in crypto/tls. Both clients and servers may send large TLS handshake records which cause servers and clients, respectively, to panic when attempting to construct responses. This affects all TLS 1.3 clients, TLS 1.2 clients which explicitly enable session resumption (by setting Config.ClientSessionCache to a non-nil value), and TLS 1.3 servers which request client certificates (by setting Config.ClientAuth >= RequestClientCert).

Weakness

The product does not properly control the allocation and maintenance of a limited resource.

Affected Software

Potential Mitigations

• Mitigation of resource exhaustion attacks requires that the target system either:

• The first of these solutions is an issue in itself though, since it may allow attackers to prevent the use of the system by a particular valid user. If the attacker impersonates the valid user, they may be able to prevent the user from accessing the server in question.

• The second solution is simply difficult to effectively institute – and even when properly done, it does not provide a full solution. It simply makes the attack require more resources on the part of the attacker.

Related Attack Patterns

• https://cwe.mitre.org/data/definitions/147.html
• https://cwe.mitre.org/data/definitions/227.html
• https://cwe.mitre.org/data/definitions/492.html

References

• https://go.dev/cl/468125
• https://go.dev/issue/58001
• https://groups.google.com/g/golang-announce/c/V0aBFqaFs_E
• https://pkg.go.dev/vuln/GO-2023-1570
• https://security.gentoo.org/glsa/202311-09
• https://go.dev/cl/468125
• https://go.dev/issue/58001
• https://groups.google.com/g/golang-announce/c/V0aBFqaFs_E
• https://pkg.go.dev/vuln/GO-2023-1570
• https://security.gentoo.org/glsa/202311-09