CVE-2021-33910
systemd: uncontrolled allocation on the stack in function unit_name_path_escape leads to crash
Severity Score
Exploit Likelihood
Affected Versions
Public Exploits
2Exploited in Wild
-Decision
Descriptions
basic/unit-name.c in systemd prior to 246.15, 247.8, 248.5, and 249.1 has a Memory Allocation with an Excessive Size Value (involving strdupa and alloca for a pathname controlled by a local attacker) that results in an operating system crash.
basic/unit-name.c en systemd anterior a las versiones 246.15, 247.8, 248.5 y 249.1 tiene una asignación de memoria con un valor de tamaño excesivo (que involucra a strdupa y alloca para un nombre de ruta controlado por un atacante local) que resulta en una caída del sistema operativo
A flaw was found in systemd. The use of alloca function with an uncontrolled size in function unit_name_path_escape allows a local attacker, able to mount a filesystem on a very long path, to crash systemd and the whole system by allocating a very large space in the stack. The highest threat from this vulnerability is to the system availability.
CVSS Scores
SSVC
- Decision:-
Timeline
- 2021-06-07 CVE Reserved
- 2021-07-20 CVE Published
- 2023-03-08 EPSS Updated
- 2024-08-04 CVE Updated
- 2024-08-04 First Exploit
- ---------- Exploited in Wild
- ---------- KEV Due Date
CWE
- CWE-400: Uncontrolled Resource Consumption
- CWE-770: Allocation of Resources Without Limits or Throttling
CAPEC
References (20)
| URL | Tag | Source |
|---|---|---|
| https://cert-portal.siemens.com/productcert/pdf/ssa-222547.pdf | X_refsource_confirm |
|
| https://security.netapp.com/advisory/ntap-20211104-0008 | Third Party Advisory |
|
| URL | Date | SRC |
|---|---|---|
| http://packetstormsecurity.com/files/163621/Sequoia-A-Deep-Root-In-Linuxs-Filesystem-Layer.html | 2024-08-04 | |
| https://www.openwall.com/lists/oss-security/2021/07/20/2 | 2024-08-04 |
Affected Vendors, Products, and Versions
| Vendor | Product | Version | Other | Status | ||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Vendor | Product | Version | Other | Status | <-- --> | Vendor | Product | Version | Other | Status |
| Systemd Project Search vendor "Systemd Project" | Systemd Search vendor "Systemd Project" for product "Systemd" | < 246.15 Search vendor "Systemd Project" for product "Systemd" and version " < 246.15" | - |
Affected
| ||||||
| Systemd Project Search vendor "Systemd Project" | Systemd Search vendor "Systemd Project" for product "Systemd" | >= 247 < 247.8 Search vendor "Systemd Project" for product "Systemd" and version " >= 247 < 247.8" | - |
Affected
| ||||||
| Systemd Project Search vendor "Systemd Project" | Systemd Search vendor "Systemd Project" for product "Systemd" | >= 248 < 248.5 Search vendor "Systemd Project" for product "Systemd" and version " >= 248 < 248.5" | - |
Affected
| ||||||
| Systemd Project Search vendor "Systemd Project" | Systemd Search vendor "Systemd Project" for product "Systemd" | >= 249 < 249.1 Search vendor "Systemd Project" for product "Systemd" and version " >= 249 < 249.1" | - |
Affected
| ||||||
| Fedoraproject Search vendor "Fedoraproject" | Fedora Search vendor "Fedoraproject" for product "Fedora" | 33 Search vendor "Fedoraproject" for product "Fedora" and version "33" | - |
Affected
| ||||||
| Fedoraproject Search vendor "Fedoraproject" | Fedora Search vendor "Fedoraproject" for product "Fedora" | 34 Search vendor "Fedoraproject" for product "Fedora" and version "34" | - |
Affected
| ||||||
| 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
| ||||||
| Netapp Search vendor "Netapp" | Hci Management Node Search vendor "Netapp" for product "Hci Management Node" | - | - |
Affected
| ||||||
| Netapp Search vendor "Netapp" | Solidfire Search vendor "Netapp" for product "Solidfire" | - | - |
Affected
| ||||||