LF-Edge EVE OS up to 8.5.x/9.4.x Service Port 8877 VTPM.md handleRequest memory allocation

Summaryinfo

A vulnerability has been found in LF-Edge EVE OS up to 8.5.x/9.4.x and classified as problematic. Affected by this issue is the function handleRequest of the file VTPM.md of the component Service Port 8877. The manipulation leads to memory allocation. This vulnerability is documented as CVE-2023-43632. The attack requires being on the local network. There is not any exploit available.

Detailsinfo

A vulnerability, which was classified as critical, has been found in LF-Edge EVE OS up to 8.5.x/9.4.x. This issue affects the function handleRequest of the file VTPM.md of the component Service Port 8877. The manipulation with an unknown input leads to a memory allocation vulnerability. Using CWE to declare the problem leads to CWE-789. The product allocates memory based on an untrusted, large size value, but it does not ensure that the size is within expected limits, allowing arbitrary amounts of memory to be allocated. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

As noted in the “VTPM.md” file in the eve documentation, “VTPM is a server listening on port 8877 in EVE, exposing limited functionality of the TPM to the clients. VTPM allows clients to execute tpm2-tools binaries from a list of hardcoded options” The communication with this server is done using protobuf, and the data is comprised of 2 parts: 1. Header 2. Data When a connection is made, the server is waiting for 4 bytes of data, which will be the header, and these 4 bytes would be parsed as uint32 size of the actual data to come. Then, in the function “handleRequest” this size is then used in order to allocate a payload on the stack for the incoming data. As this payload is allocated on the stack, this will allow overflowing the stack size allocated for the relevant process with freely controlled data. * An attacker can crash the system. * An attacker can gain control over the system, specifically on the “vtpm_server” process which has very high privileges.

The weakness was released 09/21/2023. It is possible to read the advisory at asrg.io. The identification of this vulnerability is CVE-2023-43632 since 09/20/2023. Technical details of the vulnerability are known, but there is no available exploit.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Vendor

• LF-Edge

Name

• EVE OS

Version

• 8.0
• 8.1
• 8.2
• 8.3
• 8.4
• 8.5
• 9.0
• 9.1
• 9.2
• 9.3
• 9.4

CPE 2.3info

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• 🔍
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CPE 2.2info

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• 🔍
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