Vulnerabilities > CVE-2021-29923
Attack vector
NETWORK Attack complexity
LOW Privileges required
NONE Confidentiality impact
NONE Integrity impact
HIGH Availability impact
NONE Summary
Go before 1.17 does not properly consider extraneous zero characters at the beginning of an IP address octet, which (in some situations) allows attackers to bypass access control that is based on IP addresses, because of unexpected octal interpretation. This affects net.ParseIP and net.ParseCIDR.
Vulnerable Configurations
Related news
References
- https://github.com/golang/go/issues/43389
- https://github.com/golang/go/issues/30999
- https://defcon.org/html/defcon-29/dc-29-speakers.html#kaoudis
- https://github.com/sickcodes/security/blob/master/advisories/SICK-2021-016.md
- https://golang.org/pkg/net/#ParseCIDR
- https://go-review.googlesource.com/c/go/+/325829/
- https://www.oracle.com/security-alerts/cpujan2022.html
- https://security.gentoo.org/glsa/202208-02
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/4CHKSFMHZVOBCZSSVRE3UEYNKARTBMTM/