What is the CVSS score of CVE-2021-40153?

CVE-2021-40153 has a CVSS 3.1 base score of 8.1 (High). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:H. EPSS exploitation probability: 2.5%.

Is there a public PoC exploit available for CVE-2021-40153?

Yes, a public proof-of-concept exploit is available for CVE-2021-40153. Prioritise patching immediately. EPSS: 2.5%.

Is there a patch available for CVE-2021-40153?

Yes, a patch is available for CVE-2021-40153. Update the affected software to the latest version immediately.

Squashfs Tools CVE-2021-40153

HIGH

Path Traversal (CWE-22)

2021-08-27 cve@mitre.org

Path Traversal Squashfs Tools Fedora Debian Linux Enterprise Linux

8.1

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

8.1 HIGH

AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:H

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:H

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Unchanged

Confidentiality

None

Integrity

High

Availability

High

Lifecycle Timeline

CVE Published

Aug 27, 2021 - 15:15 nvd

HIGH 8.1

DescriptionNVD

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.

AnalysisAI

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. Rated high severity (CVSS 8.1), this vulnerability is remotely exploitable, no authentication required, low attack complexity. Public exploit code available.

Technical ContextAI

This vulnerability is classified as Path Traversal (CWE-22), which allows attackers to access files and directories outside the intended path. 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. Affected products include: Squashfs-Tools Project Squashfs-Tools, Fedoraproject Fedora, Debian Debian Linux, Redhat Enterprise Linux.

RemediationAI

A vendor patch is available. Apply the latest security update as soon as possible. Validate and canonicalize file paths. Use chroot or sandboxing. Reject input containing path separators or '../' sequences.