{"id":"CVE-2023-43632","aliases":["GHSA-6jp5-grgh-jw42","GO-2026-4422"],"url":"https://o3.security/vulnerability/CVE-2023-43632","summary":"Freely Allocate Buffer on The Stack With Data From Socket","details":"\nAs noted in the “VTPM.md” file in the eve documentation, “VTPM is a server listening on port\n8877 in EVE, exposing limited functionality of the TPM to the clients. \nVTPM allows clients to\nexecute tpm2-tools binaries from a list of hardcoded options”\nThe communication with this server is done using protobuf, and the data is comprised of 2\nparts:\n\n1. Header\n\n2. Data\n\nWhen a connection is made, the server is waiting for 4 bytes of data, which will be the header,\nand these 4 bytes would be parsed as uint32 size of the actual data to come.\n\nThen, in the function “handleRequest” this size is then used in order to allocate a payload on\nthe stack for the incoming data.\n\nAs this payload is allocated on the stack, this will allow overflowing the stack size allocated for\nthe relevant process with freely controlled data.\n\n* An attacker can crash the system. \n* An attacker can gain control over the system, specifically on the “vtpm_server” process\nwhich has very high privileges.\n\n\n","published":"2023-09-21T13:13:30.579Z","modified":"2026-07-31T18:29:53.581217445Z","cvss":{"score":9,"severity":"CRITICAL","vector":"CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H"},"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Go","name":"github.com/lf-edge/eve","fixedVersion":"0.0.0-20230519072751-977f42b07fa9"}],"fix":null,"references":[{"type":"ADVISORY","url":"https://asrg.io/security-advisories/cve-2023-43632/"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/43xxx/CVE-2023-43632.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2023-43632"},{"type":"PACKAGE","url":"https://github.com/lf-edge/eve"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-07-31T18:29:53.581217445Z"}}