CERTVDECVELIST:CVE-2020-12494CVE-2020-12494 Beckhoff: Etherleak in TwinCAT RT network driver
5.3 Medium
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
LOW
Integrity Impact
NONE
Availability Impact
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
5.2 Medium
AI Score
Confidence
High
0.001 Low
EPSS
Percentile
35.9%
Beckhoff’s TwinCAT RT network driver for Intel 8254x and 8255x is providing EtherCAT functionality. The driver implements real-time features. Except for Ethernet frames sent from real-time functionality, all other Ethernet frames sent through the driver are not padded if their payload is less than the minimum Ethernet frame size. Instead, arbitrary memory content is transmitted within in the padding bytes of the frame. Most likely this memory contains slices from previously transmitted or received frames. By this method, memory content is disclosed, however, an attacker can hardly control which memory content is affected. For example, the disclosure can be provoked with small sized ICMP echo requests sent to the device.
CNA Affected
[
{
"product": "TwinCat Driver for Intel 8254x (Tcl8254x.sys)",
"vendor": "Beckhoff",
"versions": [
{
"lessThanOrEqual": "3.1.0.3603 for TwinCAT 3.1 4024",
"status": "affected",
"version": "unspecified",
"versionType": "custom"
},
{
"lessThanOrEqual": "3.1.0.3512 for TwinCAT 3.1 4022",
"status": "affected",
"version": "unspecified",
"versionType": "custom"
},
{
"lessThanOrEqual": "2.11.0.2120 for TwinCAT 2.11 2350",
"status": "affected",
"version": "unspecified",
"versionType": "custom"
}
]
},
{
"product": "TwinCat Driver for Intel 8255x (Tcl8255x.sys)",
"vendor": "Beckhoff",
"versions": [
{
"lessThanOrEqual": "3.1.0.3600 for TwinCAT 3.1 4024",
"status": "affected",
"version": "unspecified",
"versionType": "custom"
},
{
"lessThanOrEqual": "3.1.0.3500 for TwinCAT 3.1 4024",
"status": "affected",
"version": "unspecified",
"versionType": "custom"
},
{
"lessThanOrEqual": "2.11.0.2117 for TwinCAT 2.11 2350",
"status": "affected",
"version": "unspecified",
"versionType": "custom"
}
]
}
]Related
5.3 Medium
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
LOW
Integrity Impact
NONE
Availability Impact
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
5.2 Medium
AI Score
Confidence
High
0.001 Low
EPSS
Percentile
35.9%