CVE-2021-29923 Information

Description

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.

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Reference

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://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/4CHKSFMHZVOBCZSSVRE3UEYNKARTBMTM/

Attack Complexity

LOW

Privileges Required

NONE

User Interaction Required

NONE

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

NONE

Availability Impact

HIGH

Base Score

NONE

Base Severity

7.5