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[email protected]CVE-2020-27737

HistoryApr 22, 2021 - 9:15 p.m.

CVE-2020-27737

2021-04-2221:15:09

CWE-125

[email protected]

web.nvd.nist.gov

cve-2020-27737

apogee pxc

nucleus net

talon tc

dns response parsing

denial-of-service

memory leak

5.8 Medium

CVSS2

Attack Vector

NETWORK

Attack Complexity

MEDIUM

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

NONE

Availability Impact

PARTIAL

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

6.5 Medium

CVSS3

Attack Vector

NETWORK

Attack Complexity

HIGH

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

LOW

Integrity Impact

NONE

Availability Impact

HIGH

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

6.6 Medium

AI Score

Confidence

High

0.002 Low

EPSS

Percentile

53.6%

JSON

A vulnerability has been identified in APOGEE PXC Compact (BACnet) (All versions < V3.5.5), APOGEE PXC Compact (P2 Ethernet) (All versions < V2.8.20), APOGEE PXC Modular (BACnet) (All versions < V3.5.5), APOGEE PXC Modular (P2 Ethernet) (All versions < V2.8.20), Nucleus NET (All versions), Nucleus ReadyStart V3 (All versions < V2017.02.3), Nucleus ReadyStart V4 (All versions < V4.1.0), Nucleus Source Code (Versions including affected DNS modules), SIMOTICS CONNECT 400 (All versions < V0.5.0.0), TALON TC Compact (BACnet) (All versions < V3.5.5), TALON TC Modular (BACnet) (All versions < V3.5.5). The DNS response parsing functionality does not properly validate various length and counts of the records. The parsing of malformed responses could result in a read past the end of an allocated structure. An attacker with a privileged position in the network could leverage this vulnerability to cause a denial-of-service condition or leak the memory past the allocated structure.

Affected configurations

NVD

Node

siemenssimotics_connect_400_firmwareRange<0.5.0.0

AND

siemenssimotics_connect_400Match-

Node

siemensnucleus_net

siemensnucleus_readystart_v3Range<2017.02.3

siemensnucleus_readystart_v4Range<4.1.0

siemensnucleus_source_codeMatch-

CPENameOperatorVersion
siemens:simotics_connect_400_firmwaresiemens simotics connect 400 firmwarelt0.5.0.0

CPE	Name	Operator	Version
siemens:simotics_connect_400_firmware	siemens simotics connect 400 firmware	lt	0.5.0.0

CNA Affected

[
  {
    "vendor": "Siemens",
    "product": "APOGEE PXC Compact (BACnet)",
    "versions": [
      {
        "version": "All versions < V3.5.5",
        "status": "affected"
      }
    ],
    "defaultStatus": "unknown"
  },
  {
    "vendor": "Siemens",
    "product": "APOGEE PXC Compact (P2 Ethernet)",
    "versions": [
      {
        "version": "All versions < V2.8.20",
        "status": "affected"
      }
    ],
    "defaultStatus": "unknown"
  },
  {
    "vendor": "Siemens",
    "product": "APOGEE PXC Modular (BACnet)",
    "versions": [
      {
        "version": "All versions < V3.5.5",
        "status": "affected"
      }
    ],
    "defaultStatus": "unknown"
  },
  {
    "vendor": "Siemens",
    "product": "APOGEE PXC Modular (P2 Ethernet)",
    "versions": [
      {
        "version": "All versions < V2.8.20",
        "status": "affected"
      }
    ],
    "defaultStatus": "unknown"
  },
  {
    "vendor": "Siemens",
    "product": "Nucleus NET",
    "versions": [
      {
        "version": "All versions",
        "status": "affected"
      }
    ],
    "defaultStatus": "unknown"
  },
  {
    "vendor": "Siemens",
    "product": "Nucleus ReadyStart V3",
    "versions": [
      {
        "version": "All versions < V2017.02.3",
        "status": "affected"
      }
    ],
    "defaultStatus": "unknown"
  },
  {
    "vendor": "Siemens",
    "product": "Nucleus ReadyStart V4",
    "versions": [
      {
        "version": "All versions < V4.1.0",
        "status": "affected"
      }
    ],
    "defaultStatus": "unknown"
  },
  {
    "vendor": "Siemens",
    "product": "Nucleus Source Code",
    "versions": [
      {
        "version": "Versions including affected DNS modules",
        "status": "affected"
      }
    ],
    "defaultStatus": "unknown"
  },
  {
    "vendor": "Siemens",
    "product": "SIMOTICS CONNECT 400",
    "versions": [
      {
        "version": "All versions < V0.5.0.0",
        "status": "affected"
      }
    ],
    "defaultStatus": "unknown"
  },
  {
    "vendor": "Siemens",
    "product": "TALON TC Compact (BACnet)",
    "versions": [
      {
        "version": "All versions < V3.5.5",
        "status": "affected"
      }
    ],
    "defaultStatus": "unknown"
  },
  {
    "vendor": "Siemens",
    "product": "TALON TC Modular (BACnet)",
    "versions": [
      {
        "version": "All versions < V3.5.5",
        "status": "affected"
      }
    ],
    "defaultStatus": "unknown"
  }
]

References

cert-portal.siemens.com/productcert/pdf/ssa-180579.pdf

cert-portal.siemens.com/productcert/pdf/ssa-669158.pdf

cert-portal.siemens.com/productcert/pdf/ssa-705111.pdf

Social References

5.8 Medium

CVSS2

Attack Vector

NETWORK

Attack Complexity

MEDIUM

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

NONE

Availability Impact

PARTIAL

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

6.5 Medium

CVSS3

Attack Vector

NETWORK

Attack Complexity

HIGH

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

LOW

Integrity Impact

NONE

Availability Impact

HIGH

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

6.6 Medium

AI Score

Confidence

High

0.002 Low

EPSS

Percentile

53.6%

JSON

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