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CVE-2021-40153 · cross-distro fix matrix

CVE-2021-40153: squashfs_opendir in unsquash-1.c in Squashfs-Tools 4.5 stores the filename in the directory entry; this is then used by unsquashfs to create the new file during the unsquash. The filename is not validated for traversal outside of the destination directory, and thus allows writing to locations outsid

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

Fix per ecosystem

Each block below is a distro release where CVE-2021-40153 has a known fix. Run the listed command on that distro to remediate.

Debian bullseye

Source: Debian Security Tracker

  • squashfs-tools→ fixed in1:4.4-2+deb11u1urgency: not yet assigned
    sudo apt-get install --only-upgrade -y squashfs-tools

Debian bookworm

Source: Debian Security Tracker

  • squashfs-tools→ fixed in1:4.5-2urgency: not yet assigned
    sudo apt-get install --only-upgrade -y squashfs-tools

Debian trixie

Source: Debian Security Tracker

  • squashfs-tools→ fixed in1:4.5-2urgency: not yet assigned
    sudo apt-get install --only-upgrade -y squashfs-tools

Alpine v3.20

Source: Alpine secdb

  • squashfs-tools→ fixed in4.5-r0
    apk update && apk add --upgrade squashfs-tools

Alpine v3.21

Source: Alpine secdb

  • squashfs-tools→ fixed in4.5-r0
    apk update && apk add --upgrade squashfs-tools

Alpine edge

Source: Alpine secdb

  • squashfs-tools→ fixed in4.5-r0
    apk update && apk add --upgrade squashfs-tools

Alpine v3.18

Source: Alpine secdb

  • squashfs-tools→ fixed in4.5-r0
    apk update && apk add --upgrade squashfs-tools

Alpine v3.19

Source: Alpine secdb

  • squashfs-tools→ fixed in4.5-r0
    apk update && apk add --upgrade squashfs-tools
Are YOU affected by CVE-2021-40153?

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