CVE-2023-4091 is a medium-severity vulnerability in Samba, affecting fedoraproject, redhat, and samba products. It allows SMB clients with read-only permissions to truncate files to zero bytes when the "acl_xattr" VFS module is configured with "acl_xattr:ignore system acls = yes". This occurs because the SMB protocol permits implicit file truncation during a read-only open request if an OVERWRITE disposition is also specified, bypassing kernel filesystem permissions. The vulnerability has a CVSS score of 6.5, indicating a network-based attack with low complexity and requiring low privileges, leading to high integrity impact (data loss) but no confidentiality impact. There is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or inclusion in CISA's KEV catalog, though it has garnered some community discussion and media coverage.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
< 4.17.12CPE matchmatch criteria | cpe:2.3:a:samba:samba:*:*:*:*:*:*:*:* | ||
>= 4.18.0, < 4.18.8CPE matchmatch criteria | cpe:2.3:a:samba:samba:*:*:*:*:*:*:*:* | ||
>= 4.19.0, < 4.19.1CPE matchmatch criteria | cpe:2.3:a:samba:samba:*:*:*:*:*:*:*:* | ||
39CPE matchmatch criteria | cpe:2.3:o:fedoraproject:fedora:39:*:*:*:*:*:*:* | ||
3.0CPE matchmatch criteria | cpe:2.3:a:redhat:storage:3.0:*:*:*:*:*:*:* |
CVSS version used by this source: 3.1
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.
The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.