High severity · published Aug 7, 2021
CVE-2021-29923
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…
7.5
CVSS
3.7%
EPSS
No
On KEV
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
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
High
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)3.7% · higher than 90% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
FE
Fedora · Fedoraproject
36 · source: NVD
GO
GO · Golang
before 1.17 · source: NVD
TI
Timesten In-memory Database · Oracle
before 21.1.1.1.0 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-29923
CVE.org
https://www.cve.org/CVERecord?id=CVE-2021-29923
Third Party Advisory
https://defcon.org/html/defcon-29/dc-29-speakers.html#kaoudis
Exploit
https://github.com/golang/go/issues/30999
Issue Tracking
https://github.com/golang/go/issues/43389
Exploit
https://github.com/sickcodes/security/blob/master/advisories/SICK-2021-016.md
Patch
https://go-review.googlesource.com/c/go/+/325829/
Vendor Advisory
https://golang.org/pkg/net/#ParseCIDR
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