Denial of service in Go

1) Resource exhaustion

EUVDB-ID: #VU17245

Risk: Low

CVSSv3.1: 6.7 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:C]

CVE-ID: CVE-2019-6486

CWE-ID: CWE-400 - Resource exhaustion

Exploit availability: No

Description

The vulnerability allows a remote attacker to cause DoS condition.

The vulnerability exists in the crypto/elliptic implementations of the P-521 and P-384 elliptic curves due to insufficient validation of user-supplied input. A remote attacker can submit specially crafted inputs via TLS handshakes, X.509 certificates, JWT tokens, ECDH shares or ECDSA signatures, consume excessive amounts of CPU and cause the service to crash.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Go programming language: 1.10.8 - 1.11.5

External links

http://bugzilla.redhat.com/show_bug.cgi?id=1668972
http://groups.google.com/forum/m/#!topic/golang-announce/mVeX35iXuSw
http://github.com/golang/go/commit/42b42f71

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability. However, proof of concept for this vulnerability is available.