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CVE-2023-4091 · cross-distro fix matrix

CVE-2023-4091: 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

Affects 8 Linux releases across 8 (distro × package) combinations.

Fix per ecosystem

Each block below is a distro release where CVE-2023-4091 has a known fix. Run the listed command on that distro to remediate.

Debian bullseye

Source: Debian Security Tracker

  • samba→ fixed in2:4.13.13+dfsg-1~deb11u6urgency: not yet assigned
    sudo apt-get install --only-upgrade -y samba

Debian bookworm

Source: Debian Security Tracker

  • samba→ fixed in2:4.17.12+dfsg-0+deb12u1urgency: not yet assigned
    sudo apt-get install --only-upgrade -y samba

Debian trixie

Source: Debian Security Tracker

  • samba→ fixed in2:4.19.1+dfsg-1urgency: not yet assigned
    sudo apt-get install --only-upgrade -y samba

Alpine v3.20

Source: Alpine secdb

  • samba→ fixed in4.18.8-r0
    apk update && apk add --upgrade samba

Alpine v3.21

Source: Alpine secdb

  • samba→ fixed in4.18.8-r0
    apk update && apk add --upgrade samba

Alpine edge

Source: Alpine secdb

  • samba→ fixed in4.18.8-r0
    apk update && apk add --upgrade samba

Alpine v3.18

Source: Alpine secdb

  • samba→ fixed in4.18.8-r0
    apk update && apk add --upgrade samba

Alpine v3.19

Source: Alpine secdb

  • samba→ fixed in4.18.8-r0
    apk update && apk add --upgrade samba
Are YOU affected by CVE-2023-4091?

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