Bug 830983 (CVE-2021-20316)

Summary:	<net-fs/samba-4.15.0: Symlink race condition (CVE-2021-20316)
Product:	Gentoo Security	Reporter:	Sam James <sam>
Component:	Vulnerabilities	Assignee:	Gentoo Security <security>
Status:	RESOLVED FIXED
Severity:	minor	CC:	hydrapolic, joakim.tjernlund, samba
Priority:	Normal
Version:	unspecified
Hardware:	All
OS:	Linux
URL:	https://marc.info/?l=samba-announce&m=164182636010686&w=2
Whiteboard:	B3 [glsa+]
Package list:		Runtime testing required:	---
Bug Depends on:	828680
Bug Blocks:

Description Sam James archtester

2022-01-11 03:43:49 UTC

Not listed on the website for some reason.

See https://marc.info/?l=samba-announce&m=164182636010686&w=2:
```

All versions of the Samba file server prior to 4.15.0 are affected by 
CVE-2021-20316. There will be no patches available for older Samba 
versions before 4.15 and 4.15 itself is already secure.

  * CVE-2021-20316: Symlink race error can allow metadata read
    and modify outside of the exported share.

https://www.samba.org/samba/security/CVE-2021-20316.html

Please update affected systems as soon as possible.
```

Earlier versions *are* affected but as explained in the advisory, can't be trivially fixed. So, probably time to stable a 4.15.x (bug 828680).

So, all we need to do is stable 4.15.x.

Comment 1 Larry the Git Cow gentoo-dev

2023-09-17 05:56:57 UTC

The bug has been referenced in the following commit(s):

https://gitweb.gentoo.org/data/glsa.git/commit/?id=5bfe8198b2352fa0ac46dbc59d078650dc544a7e

commit 5bfe8198b2352fa0ac46dbc59d078650dc544a7e
Author:     GLSAMaker <glsamaker@gentoo.org>
AuthorDate: 2023-09-17 05:56:23 +0000
Commit:     Sam James <sam@gentoo.org>
CommitDate: 2023-09-17 05:56:46 +0000

    [ GLSA 202309-06 ] Samba: Multiple Vulnerabilities
    
    Bug: https://bugs.gentoo.org/820566
    Bug: https://bugs.gentoo.org/821688
    Bug: https://bugs.gentoo.org/830983
    Bug: https://bugs.gentoo.org/832433
    Bug: https://bugs.gentoo.org/861512
    Bug: https://bugs.gentoo.org/866225
    Bug: https://bugs.gentoo.org/869122
    Bug: https://bugs.gentoo.org/878273
    Bug: https://bugs.gentoo.org/880437
    Bug: https://bugs.gentoo.org/886153
    Bug: https://bugs.gentoo.org/903621
    Bug: https://bugs.gentoo.org/905320
    Bug: https://bugs.gentoo.org/910334
    Signed-off-by: GLSAMaker <glsamaker@gentoo.org>
    Signed-off-by: Sam James <sam@gentoo.org>

 glsa-202309-06.xml | 86 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 86 insertions(+)