CVE-2021-40153
squashfs-tools: unvalidated filepaths allow writing outside of destination
Severity Score
Exploit Likelihood
Affected Versions
Public Exploits
1Exploited in Wild
-Decision
Descriptions
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.
La función squashfs_opendir en el archivo unsquash-1.c en Squashfs-Tools versión 4.5, almacena el nombre del archivo en la entrada del directorio; esto es entonces usado por unsquashfs para crear el nuevo archivo durante el desensamblaje. El nombre de archivo no se comprueba para saltar fuera del directorio de destino, y por lo tanto permite escribir en lugares fuera del destino.
A flaw was found in Squashfs-tools, where it is vulnerable to attacks similar to zip-slip. During extraction, a file can escape the destination directory either via the '../' string to access the parent directory or via symlinks. This flaw allows a specially crafted squashfs archive to install or overwrite files outside of the destination directory.
CVSS Scores
SSVC
- Decision:-
Timeline
- 2021-08-27 CVE Reserved
- 2021-08-27 CVE Published
- 2024-07-05 EPSS Updated
- 2024-08-04 CVE Updated
- 2024-08-04 First Exploit
- ---------- Exploited in Wild
- ---------- KEV Due Date
CWE
- CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
CAPEC
References (10)
| URL | Tag | Source |
|---|---|---|
| https://bugs.launchpad.net/ubuntu/+source/squashfs-tools/+bug/1941790 | Third Party Advisory | |
| https://lists.debian.org/debian-lts-announce/2021/08/msg00030.html | Mailing List |
|
| URL | Date | SRC |
|---|---|---|
| https://github.com/plougher/squashfs-tools/issues/72 | 2024-08-04 |
| URL | Date | SRC |
|---|---|---|
| https://github.com/plougher/squashfs-tools/commit/79b5a555058eef4e1e7ff220c344d39f8cd09646 | 2023-11-07 |
Affected Vendors, Products, and Versions
| Vendor | Product | Version | Other | Status | ||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Vendor | Product | Version | Other | Status | <-- --> | Vendor | Product | Version | Other | Status |
| Squashfs-tools Project Search vendor "Squashfs-tools Project" | Squashfs-tools Search vendor "Squashfs-tools Project" for product "Squashfs-tools" | 4.5 Search vendor "Squashfs-tools Project" for product "Squashfs-tools" and version "4.5" | - |
Affected
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| Fedoraproject Search vendor "Fedoraproject" | Fedora Search vendor "Fedoraproject" for product "Fedora" | 34 Search vendor "Fedoraproject" for product "Fedora" and version "34" | - |
Affected
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| Debian Search vendor "Debian" | Debian Linux Search vendor "Debian" for product "Debian Linux" | 9.0 Search vendor "Debian" for product "Debian Linux" and version "9.0" | - |
Affected
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| Debian Search vendor "Debian" | Debian Linux Search vendor "Debian" for product "Debian Linux" | 10.0 Search vendor "Debian" for product "Debian Linux" and version "10.0" | - |
Affected
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| Redhat Search vendor "Redhat" | Enterprise Linux Search vendor "Redhat" for product "Enterprise Linux" | 7.0 Search vendor "Redhat" for product "Enterprise Linux" and version "7.0" | - |
Affected
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| Redhat Search vendor "Redhat" | Enterprise Linux Search vendor "Redhat" for product "Enterprise Linux" | 8.0 Search vendor "Redhat" for product "Enterprise Linux" and version "8.0" | - |
Affected
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| Fedoraproject Search vendor "Fedoraproject" | Fedora Search vendor "Fedoraproject" for product "Fedora" | 33 Search vendor "Fedoraproject" for product "Fedora" and version "33" | - |
Affected
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