Vulnerability CVE-2023-4091: Information
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.
Severity: MEDIUM (6.5) Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
Fixed packages
Package name | Branch | Fixed in version | Version from repository | Errata ID | Task # | State |
|---|---|---|---|---|---|---|
| samba | sisyphus | 4.17.12-alt1 | 4.20.1-alt2 | ALT-PU-2023-6448-1 | 332020 | Fixed |
| samba | sisyphus_e2k | 4.17.12-alt1 | 4.20.1-alt1 | ALT-PU-2023-6495-1 | - | Fixed |
| samba | sisyphus_riscv64 | 4.17.12-alt1 | 4.20.1-alt2 | ALT-PU-2023-6523-1 | - | Fixed |
| samba | p10 | 4.17.12-alt3 | 4.19.6-alt2 | ALT-PU-2023-7794-2 | 332201 | Fixed |
| samba | p10_e2k | 4.17.12-alt3 | 4.19.6-alt2 | ALT-PU-2023-7914-1 | - | Fixed |
| samba | c9f2 | 4.16.11-alt0.c9.2 | 4.14.14-alt0.c9.1 | ALT-PU-2024-8331-1 | 336563 | In work |
| samba | p11 | 4.17.12-alt1 | 4.20.1-alt1 | ALT-PU-2023-6448-1 | 332020 | Fixed |