CVE-2020-14382
cryptsetup: Out-of-bounds write when validating segments
Severity Score
Exploit Likelihood
Affected Versions
Public Exploits
0Exploited in Wild
-Decision
Descriptions
A vulnerability was found in upstream release cryptsetup-2.2.0 where, there's a bug in LUKS2 format validation code, that is effectively invoked on every device/image presenting itself as LUKS2 container. The bug is in segments validation code in file 'lib/luks2/luks2_json_metadata.c' in function hdr_validate_segments(struct crypt_device *cd, json_object *hdr_jobj) where the code does not check for possible overflow on memory allocation used for intervals array (see statement "intervals = malloc(first_backup * sizeof(*intervals));"). Due to the bug, library can be *tricked* to expect such allocation was successful but for far less memory then originally expected. Later it may read data FROM image crafted by an attacker and actually write such data BEYOND allocated memory.
Se encontró una vulnerabilidad en la versión previa cryptsetup-2.2.0 donde se presenta un error en el código de comprobación del formato LUKS2, que es invocado efectivamente en cada dispositivo e imagen que se presenta como contenedor de LUKS2. El bug está en el código de comprobación de segmentos en el archivo "lib/luks2/luks2_json_metadata.c" en la función hdr_validate_segments (struct crypt_device *cd, json_object *hdr_jobj) donde el código no comprueba un posible desbordamiento en la asignación de memoria usada para una matriz de intervalos (ver sentencia "intervals = malloc(first_backup * sizeof(*intervals));"). Debido al bug, la biblioteca puede ser *tricked* para esperar que dicha asignación haya sido realizada con éxito, pero para mucha menos memoria de la que se esperaba originalmente. Más tarde, puede leer datos DESDE una imagen creada por un atacante y escribir esos datos MÁS ALLÁ de la memoria asignada
A flaw was found in the way cryptsetup parses encrypted images with invalid segments. This flaw allows a local attacker to crash an application compiled with cryptsetup, or in some cases, cause arbitrary code execution when parsing specially crafted encrypted images. The highest threat from this vulnerability is to confidentiality, integrity, as well as system availability.
CVSS Scores
SSVC
- Decision:-
Timeline
- 2020-06-17 CVE Reserved
- 2020-09-16 CVE Published
- 2024-07-21 EPSS Updated
- 2024-08-04 CVE Updated
- ---------- Exploited in Wild
- ---------- KEV Due Date
- ---------- First Exploit
CWE
- CWE-787: Out-of-bounds Write
CAPEC
References (5)
| URL | Tag | Source |
|---|
| URL | Date | SRC |
|---|
| URL | Date | SRC |
|---|---|---|
| https://bugzilla.redhat.com/show_bug.cgi?id=1874712 | 2021-01-26 |
Affected Vendors, Products, and Versions
| Vendor | Product | Version | Other | Status | ||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Vendor | Product | Version | Other | Status | <-- --> | Vendor | Product | Version | Other | Status |
| Cryptsetup Project Search vendor "Cryptsetup Project" | Cryptsetup Search vendor "Cryptsetup Project" for product "Cryptsetup" | 2.2.0 Search vendor "Cryptsetup Project" for product "Cryptsetup" and version "2.2.0" | - |
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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| Canonical Search vendor "Canonical" | Ubuntu Linux Search vendor "Canonical" for product "Ubuntu Linux" | 20.04 Search vendor "Canonical" for product "Ubuntu Linux" and version "20.04" | lts |
Affected
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| Fedoraproject Search vendor "Fedoraproject" | Fedora Search vendor "Fedoraproject" for product "Fedora" | 31 Search vendor "Fedoraproject" for product "Fedora" and version "31" | - |
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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