Vulnerability Name:

CVE-2021-34761 (CCN-212256)

Assigned:2021-10-27
Published:2021-10-27
Updated:2022-10-27
Summary:A vulnerability in Cisco Firepower Threat Defense (FTD) Software could allow an authenticated, local attacker to overwrite or append arbitrary data to system files using root-level privileges. The attacker must have administrative credentials on the device. This vulnerability is due to incomplete validation of user input for a specific CLI command. An attacker could exploit this vulnerability by authenticating to the device with administrative privileges and issuing a CLI command with crafted user parameters. A successful exploit could allow the attacker to overwrite or append arbitrary data to system files using root-level privileges.
CVSS v3 Severity:6.0 Medium (CVSS v3.1 Vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:H)
5.2 Medium (Temporal CVSS v3.1 Vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:H/E:U/RL:O/RC:C)
Exploitability Metrics:Attack Vector (AV): Local
Attack Complexity (AC): Low
Privileges Required (PR): High
User Interaction (UI): None
Scope:Scope (S): Unchanged
Impact Metrics:Confidentiality (C): None
Integrity (I): High
Availibility (A): High
4.4 Medium (CCN CVSS v3.1 Vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:N)
3.9 Low (CCN Temporal CVSS v3.1 Vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:N/E:U/RL:O/RC:C)
Exploitability Metrics:Attack Vector (AV): Local
Attack Complexity (AC): Low
Privileges Required (PR): High
User Interaction (UI): None
Scope:Scope (S): Unchanged
Impact Metrics:Confidentiality (C): None
Integrity (I): High
Availibility (A): None
CVSS v2 Severity:6.6 Medium (CVSS v2 Vector: AV:L/AC:L/Au:N/C:N/I:C/A:C)
Exploitability Metrics:Access Vector (AV): Local
Access Complexity (AC): Low
Authentication (Au): None
Impact Metrics:Confidentiality (C): None
Integrity (I): Complete
Availibility (A): Complete
4.6 Medium (CCN CVSS v2 Vector: AV:L/AC:L/Au:S/C:N/I:C/A:N)
Exploitability Metrics:Access Vector (AV): Local
Access Complexity (AC): Low
Athentication (Au): Single_Instance
Impact Metrics:Confidentiality (C): None
Integrity (I): Complete
Availibility (A): None
Vulnerability Type:CWE-668
Vulnerability Consequences:Bypass Security
References:Source: MITRE
Type: CNA
CVE-2021-34761

Source: XF
Type: UNKNOWN
cisco-cve202134761-sec-bypass(212256)

Source: CCN
Type: Cisco Security Advisory cisco-sa-ftd-file-write-SHVcmQVc
Cisco Firepower Threat Defense Software CLI Arbitrary File Write Vulnerability

Source: CISCO
Type: Vendor Advisory
20211027 Cisco Firepower Threat Defense Software CLI Arbitrary File Write Vulnerability

Vulnerable Configuration:Configuration 1:
  • cpe:/a:cisco:firepower_management_center_virtual_appliance:6.2.3:*:*:*:*:*:*:*
  • OR cpe:/a:cisco:sourcefire_defense_center:6.4.0:*:*:*:*:*:*:*
  • OR cpe:/a:cisco:firepower_threat_defense:*:*:*:*:*:*:*:* (Version >= 7.0.0 and < 7.0.1)
  • OR cpe:/a:cisco:firepower_threat_defense:*:*:*:*:*:*:*:* (Version >= 6.7.0 and < 6.7.0.3)
  • OR cpe:/a:cisco:firepower_threat_defense:*:*:*:*:*:*:*:* (Version >= 6.4.0 and < 6.4.0.13)
  • OR cpe:/a:cisco:sourcefire_defense_center:6.2.3:*:*:*:*:*:*:*
  • OR cpe:/a:cisco:sourcefire_defense_center:7.1.0:*:*:*:*:*:*:*
  • OR cpe:/a:cisco:firepower_management_center_virtual_appliance:7.1.0:*:*:*:*:*:*:*
  • OR cpe:/a:cisco:sourcefire_defense_center:6.6.1:*:*:*:*:*:*:*
  • OR cpe:/a:cisco:sourcefire_defense_center:6.7.0:*:*:*:*:*:*:*
  • OR cpe:/a:cisco:sourcefire_defense_center:7.0.0:*:*:*:*:*:*:*
  • OR cpe:/a:cisco:firepower_management_center_virtual_appliance:6.4.0:*:*:*:*:*:*:*
  • OR cpe:/a:cisco:firepower_management_center_virtual_appliance:6.6.1:*:*:*:*:*:*:*
  • OR cpe:/a:cisco:firepower_management_center_virtual_appliance:6.7.0:*:*:*:*:*:*:*
  • OR cpe:/a:cisco:firepower_management_center_virtual_appliance:7.0.0:*:*:*:*:*:*:*
  • OR cpe:/a:cisco:firepower_threat_defense:*:*:*:*:*:*:*:* (Version >= 6.6.0 and < 6.6.5)

    • Configuration CCN 1:
  • cpe:/a:cisco:firepower_threat_defense_software:*:*:*:*:*:*:*:*

    • * Denotes that component is vulnerable
    BACK
    cisco firepower management center virtual appliance 6.2.3
    cisco sourcefire defense center 6.4.0
    cisco firepower threat defense *
    cisco firepower threat defense *
    cisco firepower threat defense *
    cisco sourcefire defense center 6.2.3
    cisco sourcefire defense center 7.1.0
    cisco firepower management center virtual appliance 7.1.0
    cisco sourcefire defense center 6.6.1
    cisco sourcefire defense center 6.7.0
    cisco sourcefire defense center 7.0.0
    cisco firepower management center virtual appliance 6.4.0
    cisco firepower management center virtual appliance 6.6.1
    cisco firepower management center virtual appliance 6.7.0
    cisco firepower management center virtual appliance 7.0.0
    cisco firepower threat defense *
    cisco firepower threat defense software *