CVE-2023-45283
Paths with a \??\ prefix may be used to access arbitrary locations on the system.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (2.76%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
The filepath package does not recognize paths with a \??\ prefix as special. On Windows, a path beginning with \??\ is a Root Local Device path equivalent to a path beginning with \\?\. Paths with a \??\ prefix may be used to access arbitrary locations on the system. For example, the path \??\c:\x is equivalent to the more common path c:\x. Before fix, Clean could convert a rooted path such as \a\..\??\b into the root local device path \??\b. Clean will now convert this to .\??\b. Similarly, Join(\, ??, b) could convert a seemingly innocent sequence of path elements into the root local device path \??\b. Join will now convert this to \.\??\b. In addition, with fix, IsAbs now correctly reports paths beginning with \??\ as absolute, and VolumeName correctly reports the \??\ prefix as a volume name. UPDATE: Go 1.20.11 and Go 1.21.4 inadvertently changed the definition of the volume name in Windows paths starting with \?, resulting in filepath.Clean(\?\c:) returning \?\c: rather than \?\c:\ (among other effects). The previous behavior has been restored.
- CVSS 3.1
- 7.5 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
- EPSS
- 2.76% probability · 85th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-22
- Affected
- golang/go
- Source
- security@golang.org
References
- http://www.openwall.com/lists/oss-security/2023/12/05/2
- https://go.dev/cl/540277Issue Tracking, Vendor Advisory
- https://go.dev/cl/541175
- https://go.dev/issue/63713Issue Tracking, Vendor Advisory
- https://go.dev/issue/64028
- https://groups.google.com/g/golang-announce/c/4tU8LZfBFkYIssue Tracking, Mailing List, Vendor Advisory
- https://groups.google.com/g/golang-dev/c/6ypN5EjibjM/m/KmLVYH_uAgAJ
- https://pkg.go.dev/vuln/GO-2023-2185Issue Tracking, Vendor Advisory
- https://security.netapp.com/advisory/ntap-20231214-0008/
- http://www.openwall.com/lists/oss-security/2023/12/05/2
- https://go.dev/cl/540277Issue Tracking, Vendor Advisory
- https://go.dev/cl/541175
- https://go.dev/issue/63713Issue Tracking, Vendor Advisory
- https://go.dev/issue/64028
- https://groups.google.com/g/golang-announce/c/4tU8LZfBFkYIssue Tracking, Mailing List, Vendor Advisory
- https://groups.google.com/g/golang-dev/c/6ypN5EjibjM/m/KmLVYH_uAgAJ
- https://pkg.go.dev/vuln/GO-2023-2185Issue Tracking, Vendor Advisory
- https://security.netapp.com/advisory/ntap-20231214-0008/
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.