Vulnerability identifier: #VU56829
Vulnerability risk: Medium
CVSSv3.1: 4.2 [CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N/E:U/RL:O/RC:C]
CVE-ID:
CWE-ID:
CWE-20
Exploitation vector: Network
Exploit availability: No
Vulnerable software:
Go programming language
Universal components / Libraries /
Scripting languages
Vendor: Google
Description
The vulnerability allows a remote attacker to bypass implemented security restrictions.
The vulnerability exists due to insufficient validation of user-supplied input in net.ParseIP and net.ParseCIDR, as the Go interpreter does not properly consider extraneous zero characters at the beginning
of an IP address octet. A remote attacker can
bypass access control that is based on IP addresses, because of
unexpected octal interpretation.
Mitigation
Install updates from vendor's website.
Vulnerable software versions
Go programming language: 1.15.8 - 1.15.15, 1.16 - 1.16.7, 1.14.15
External links
http://github.com/golang/go/issues/43389
http://github.com/golang/go/issues/30999
http://defcon.org/html/defcon-29/dc-29-speakers.html#kaoudis
http://github.com/sickcodes/security/blob/master/advisories/SICK-2021-016.md
http://golang.org/pkg/net/#ParseCIDR
http://go-review.googlesource.com/c/go/+/325829/
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.