[ASA-202107-42] go: denial of service
diabonas at archlinux.org
Tue Jul 20 19:30:53 UTC 2021
Arch Linux Security Advisory ASA-202107-42
Date : 2021-07-20
CVE-ID : CVE-2021-34558
Package : go
Type : denial of service
Remote : Yes
Link : https://security.archlinux.org/AVG-2147
The package go before version 2:1.16.6-1 is vulnerable to denial of
Upgrade to 2:1.16.6-1.
# pacman -Syu "go>=2:1.16.6-1"
The problem has been fixed upstream in version 1.16.6.
Clients that disable all TLS_RSA cipher suites (that is, TLS 1.0–1.2
cipher suites without ECDHE), as well as TLS 1.3-only clients, are
A security issue has been found in Go before version 1.16.6. crypto/tls
clients can panic when provided a certificate of the wrong type for the
negotiated parameters. net/http clients performing HTTPS requests are
also affected. The panic can be triggered by an attacker in a
privileged network position without access to the server certificate's
private key, as long as a trusted ECDSA or Ed25519 certificate for the
server exists (or can be issued), or the client is configured with
Config.InsecureSkipVerify. Clients that disable all TLS_RSA cipher
suites (that is, TLS 1.0–1.2 cipher suites without ECDHE), as well as
TLS 1.3-only clients, are unaffected.
A man-in-the-middle attacker able to intercept a TLS negotiation could
crash a TLS client by injecting a crafted invalid certificate.
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