#VU73227 Use of insufficiently random values in crypto - CVE-2019-11840

Vulnerability identifier: #VU73227

Vulnerability risk: Medium

CVSSv4.0: 4.6 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2019-11840

CWE-ID: CWE-330

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
crypto
Universal components / Libraries / Libraries used by multiple products

Vendor: Go

Description

The vulnerability allows a remote attacker to gain access to sensitive information.

The vulnerability exists in the amd64 implementation of golang.org/x/crypto/salsa20 and golang.org/x/crypto/salsa20/salsa. A remote unauthenticated attacker can trigger the vulnerability and gain access to sensitive information.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

crypto: before 0.0.0-0.20190320223903-b7391e95e576

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External links
https://groups.google.com/forum/#!msg/golang-announce/tjyNcJxb2vQ/n0NRBziSCAAJ
https://go.googlesource.com/crypto/+/b7391e95e576cacdcdd422573063bc057239113d
https://github.com/golang/go/issues/30965
https://bugzilla.redhat.com/show_bug.cgi?id=1691529
https://lists.debian.org/debian-lts-announce/2019/06/msg00029.html
https://lists.debian.org/debian-lts-announce/2020/10/msg00014.html
https://lists.debian.org/debian-lts-announce/2020/11/msg00016.html
https://lists.debian.org/debian-lts-announce/2020/11/msg00030.html
https://lists.debian.org/debian-lts-announce/2021/01/msg00015.html

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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.