CVE-2023-4091
Samba: smb clients can truncate files with read-only permissions
概要
Samba: smb clients can truncate files with read-only permissions
原文の説明
取得元が公開している説明をそのまま載せています (多くは英語)。
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.
ディストリビューション別の修正状況
各ディストリビューションが公開している、この CVE の修正パッケージ
- Alpine Linux ALPINE-CVE-2023-4091 samba 修正版: 4.18.8-r0
- Debian DEBIAN-CVE-2023-4091 samba 修正版: 2:4.13.13+dfsg-1~deb11u6
参照URL
- advisory access.redhat.com
- advisory access.redhat.com
- advisory access.redhat.com
- advisory access.redhat.com
- advisory access.redhat.com
- advisory access.redhat.com
- advisory access.redhat.com
- advisory github.com
- advisory nvd.nist.gov
- advisory security.netapp.com
- report bugzilla.redhat.com
- report bugzilla.samba.org
- web access.redhat.com
- web lists.debian.org
- web lists.fedoraproject.org
- web samba.org