oss-security - Go 1.24.3 fixes CVE-2025-22873: os: Root permits access to parent directory

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Message-ID: <120eeb82-4ce9-4507-9aab-79d17c98a992@oracle.com>
Date: Tue, 6 May 2025 12:18:21 -0700
From: Alan Coopersmith <alan.coopersmith@...cle.com>
To: oss-security@...ts.openwall.com
Subject: Go 1.24.3 fixes CVE-2025-22873: os: Root permits
 access to parent directory

https://groups.google.com/g/golang-announce/c/UZoIkUT367A/m/5WDxKizJAQAJ announces:

> Hello gophers,
> 
> We have just released Go versions 1.24.3 and 1.23.9, minor point releases.
> 
> The Go 1.24.3 minor release includes 1 security fix following the security policy:
> 
>     os: Root permits access to parent directory
> 
>     It was possible to improperly access the parent directory of an os.Root
>     by opening a filename ending in "../". For example, Root.Open("../") would
>     open the parent directory of the Root. This escape only permits opening
>     the parent directory itself, not ancestors of the parent or files contained
>     within the parent.
> 
>     Root now correctly returns an error in this case.
> 
>     This is CVE-2025-22873 and Go issue https://go.dev/issue/73555.
> 
>     Thanks to Dan Sebastian Thrane of SDU eScience Center for reporting this issue.
> 
> This security fix only applies to Go 1.24.x releases. Go 1.23.x releases are not affected by this.
> 
> View the release notes for more information:
> https://go.dev/doc/devel/release#go1.24.3
> 
> You can download binary and source distributions from the Go website:
> https://go.dev/dl/
> 
> To compile from source using a Git clone, update to the release with
> git checkout go1.24.3 and build as usual.
> 
> Thanks to everyone who contributed to the releases.
> Cheers,
> Cherry and Carlos for the Go team

-- 
         -Alan Coopersmith-                 alan.coopersmith@...cle.com
          Oracle Solaris Engineering - https://blogs.oracle.com/solaris

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