Vulnerability DatabaseCVE-2021-40153
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CVE-2021-40153
August 27, 2021
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 outside of the destination.
Related Resources (14)
https://lists.debian.org/debian-lts-announce/2021/08/msg00030.html
https://access.redhat.com/security/cve/CVE-2021-40153
https://github.com/plougher/squashfs-tools/issues/72
https://security.alpinelinux.org/vuln/CVE-2021-40153
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RAOZ4BKWAC4Y3U2K5MMW3S77HWWXHQDL/
https://people.canonical.com/~ubuntu-security/cve/CVE-2021-40153
https://www.debian.org/security/2021/dsa-4967
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/GSMRKVJMJFX3MB7D3PXJSYY3TLZROE5S/
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/RAOZ4BKWAC4Y3U2K5MMW3S77HWWXHQDL/
https://security.gentoo.org/glsa/202305-29
https://github.com/plougher/squashfs-tools/commit/79b5a555058eef4e1e7ff220c344d39f8cd09646
https://security-tracker.debian.org/tracker/CVE-2021-40153
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/GSMRKVJMJFX3MB7D3PXJSYY3TLZROE5S/
https://bugs.launchpad.net/ubuntu/+source/squashfs-tools/+bug/1941790
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CVSS v4
Base Score:
7.2
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
PASSIVE
Vulnerable System Confidentiality
NONE
Vulnerable System Integrity
HIGH
Vulnerable System Availability
HIGH
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
8.1
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality
NONE
Integrity
HIGH
Availability
HIGH
CVSS v2
Base Score:
5.8
Access Vector
NETWORK
Access Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
EPSS
Base Score:
0.54