Bug 6858 - [Anolis OS 23] Bugfix for CVE-2023-4091
Summary: [Anolis OS 23] Bugfix for CVE-2023-4091
Status: RESOLVED FIXED
Alias: None
Product: Anolis OS 23
Classification: Anolis OS
Component: BaseOS Packages (show other bugs) BaseOS Packages
Version: unspecified
Hardware: All Linux
: P4-Low S4-trivial
Target Milestone: ---
Assignee: happy_orange
QA Contact: bolong_tbl
URL:
Whiteboard:
Keywords: CVE
Depends on:
Blocks:
 
Reported: 2023-10-17 11:49 UTC by 小龙
Modified: 2023-10-17 11:51 UTC (History)
0 users

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Description 小龙 admin 2023-10-17 11:49:30 UTC 
Description:
A vulnerability was discovered in Samba, where the flaw allows SMB clients to truncate files, even with read-only permissions when the Samba VFS module "acl_xattr" is configured with "acl_xattr:ignore system acls = yes". The SMB protocol allows opening files when the client requests read-only access but then implicitly truncates the opened file to 0 bytes if the client specifies a separate OVERWRITE create disposition request. The issue arises in configurations that bypass kernel file system permissions checks, relying solely on Samba's permissions.

Broken commit info:

Bugfix commit info:
https://download.samba.orghttps://download.samba.org/pub/samba/ftp/patches/security/samba-4.17.12-security-2023-10-10.patch
https://download.samba.orghttps://download.samba.org/pub/samba/ftp/patches/security/samba-4.18.8-security-2023-10-10.patch
https://download.samba.orghttps://download.samba.org/pub/samba/ftp/patches/security/samba-4.19.1-security-2023-10-10.patch
Comment 1 小龙 admin 2023-10-17 11:51:13 UTC 
PR: 
https://gitee.com/src-anolis-os/samba/pulls/36