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[email protected]CVE-2021-23842

HistoryJan 19, 2022 - 9:15 p.m.

CVE-2021-23842

2022-01-1921:15:08

CWE-798

CWE-321

[email protected]

web.nvd.nist.gov

cve-2021-23842

amc2

blowfish

symmetric encryption

key retrieval

network traffic

firmware

vulnerability

3.6 Low

CVSS2

Attack Vector

LOCAL

Attack Complexity

LOW

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

PARTIAL

Availability Impact

NONE

AV:L/AC:L/Au:N/C:P/I:P/A:N

7.1 High

CVSS3

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

NONE

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

6.7 Medium

AI Score

Confidence

High

0.0004 Low

EPSS

Percentile

12.7%

JSON

Communication to the AMC2 uses a state-of-the-art cryptographic algorithm for symmetric encryption called Blowfish. An attacker could retrieve the key from the firmware to decrypt network traffic between the AMC2 and the host system. Thus, an attacker can exploit this vulnerability to decrypt and modify network traffic, decrypt and further investigate the device's firmware file, and change the device configuration. The attacker needs to have access to the local network, typically even the same subnet.

Affected configurations

NVD

Node

boschamc2_firmwareMatch-

AND

boschamc2Match-

Node

boschaccess_management_systemMatch3.0

Node

boschaccess_professional_editionRange≤3.8.0

Node

boschbuilding_integration_systemRange<4.9.1

CPENameOperatorVersion
bosch:amc2_firmwarebosch amc2 firmwareeq-

CPE	Name	Operator	Version
bosch:amc2_firmware	bosch amc2 firmware	eq	-

CNA Affected

[
  {
    "product": "AMS",
    "vendor": "Bosch",
    "versions": [
      {
        "lessThan": "4.0",
        "status": "affected",
        "version": "unspecified",
        "versionType": "custom"
      }
    ]
  },
  {
    "product": "APE",
    "vendor": "Bosch",
    "versions": [
      {
        "lessThanOrEqual": "3.8.x",
        "status": "affected",
        "version": "unspecified",
        "versionType": "custom"
      }
    ]
  },
  {
    "product": "BIS",
    "vendor": "Bosch",
    "versions": [
      {
        "lessThan": "4.9.1",
        "status": "affected",
        "version": "unspecified",
        "versionType": "custom"
      }
    ]
  },
  {
    "product": "AMC2",
    "vendor": "Bosch",
    "versions": [
      {
        "status": "affected",
        "version": "all"
      }
    ]
  }
]

References

psirt.bosch.com/security-advisories/BOSCH-SA-940448-BT.html

3.6 Low

CVSS2

Attack Vector

LOCAL

Attack Complexity

LOW

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

PARTIAL

Availability Impact

NONE

AV:L/AC:L/Au:N/C:P/I:P/A:N

7.1 High

CVSS3

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

NONE

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

6.7 Medium

AI Score

Confidence

High

0.0004 Low

EPSS

Percentile

12.7%

JSON

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