Vulnerability Details : CVE-2021-1256
A vulnerability in the CLI of Cisco Firepower Threat Defense (FTD) Software could allow an authenticated, local attacker to overwrite files on the file system of an affected device by using directory traversal techniques. A successful exploit could cause system instability if important system files are overwritten. This vulnerability is due to insufficient validation of user input for the file path in a specific CLI command. An attacker could exploit this vulnerability by logging in to a targeted device and issuing a specific CLI command with crafted user input. A successful exploit could allow the attacker to overwrite arbitrary files on the file system of the affected device. The attacker would need valid user credentials on the device.
Vulnerability category: Directory traversal
Products affected by CVE-2021-1256
- cpe:2.3:a:cisco:firepower_threat_defense:*:*:*:*:*:*:*:*
- cpe:2.3:a:cisco:firepower_threat_defense:*:*:*:*:*:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2021-1256
0.04%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 8 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2021-1256
Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
---|---|---|---|---|---|---|
3.6
|
LOW | AV:L/AC:L/Au:N/C:N/I:P/A:P |
3.9
|
4.9
|
NIST | |
6.0
|
MEDIUM | CVSS:3.0/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:H |
0.8
|
5.2
|
Cisco Systems, Inc. | |
6.0
|
MEDIUM | CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:H |
0.8
|
5.2
|
NIST |
CWE ids for CVE-2021-1256
-
The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory.Assigned by: nvd@nist.gov (Primary)
-
The product makes files or directories accessible to unauthorized actors, even though they should not be.Assigned by:
- nvd@nist.gov (Primary)
- ykramarz@cisco.com (Secondary)
References for CVE-2021-1256
-
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ftd-file-overwrite-XknRjGdB
Cisco Firepower Threat Defense Software Command File Overwrite VulnerabilityVendor Advisory
-
https://kc.mcafee.com/corporate/index?page=content&id=SB10382
Security Bulletin - McAfee Agent update fixes three vulnerabilities (CVE-2021-1256, CVE-2021-1257, and CVE-2021-1258)Not Applicable;Third Party Advisory
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