{"api_version":"1","generated_at":"2026-06-27T06:16:48+00:00","cve":"CVE-2023-43809","urls":{"html":"https://cve.report/CVE-2023-43809","api":"https://cve.report/api/cve/CVE-2023-43809.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2023-43809","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2023-43809"},"summary":{"title":"CVE-2023-43809","description":"Soft Serve is a self-hostable Git server for the command line. Prior to version 0.6.2, a security vulnerability in Soft Serve could allow an unauthenticated, remote attacker to bypass public key authentication when keyboard-interactive SSH authentication is active, through the `allow-keyless` setting, and the public key requires additional client-side verification for example using FIDO2 or GPG. This is due to insufficient validation procedures of the public key step during SSH request handshake, granting unauthorized access if the keyboard-interaction mode is utilized. An attacker could exploit this vulnerability by presenting manipulated SSH requests using keyboard-interactive authentication mode. This could potentially result in unauthorized access to the Soft Serve. Users should upgrade to the latest Soft Serve version `v0.6.2` to receive the patch for this issue. To workaround this vulnerability without upgrading, users can temporarily disable Keyboard-Interactive SSH Authentication using the `allow-keyless` setting.","state":"PUBLIC","assigner":"security-advisories@github.com","published_at":"2023-10-04 21:15:00","updated_at":"2023-10-10 20:12:00"},"problem_types":["CWE-287"],"metrics":[],"references":[{"url":"https://github.com/charmbracelet/soft-serve/issues/389","name":"https://github.com/charmbracelet/soft-serve/issues/389","refsource":"MISC","tags":[],"title":"Public key authentication bypass despite client-side keypair authn failure when `allow-keyless` is true · Issue #389 · charmbracelet/soft-serve · GitHub","mime":"text/html","httpstatus":"200","archivestatus":"404"},{"url":"https://github.com/charmbracelet/soft-serve/releases/tag/v0.6.2","name":"https://github.com/charmbracelet/soft-serve/releases/tag/v0.6.2","refsource":"MISC","tags":[],"title":"Release v0.6.2 · charmbracelet/soft-serve · GitHub","mime":"text/html","httpstatus":"200","archivestatus":"404"},{"url":"https://github.com/charmbracelet/soft-serve/commit/407c4ec72d1006cee1ff8c1775e5bcc091c2bc89","name":"https://github.com/charmbracelet/soft-serve/commit/407c4ec72d1006cee1ff8c1775e5bcc091c2bc89","refsource":"MISC","tags":[],"title":"fix(ssh): add authentication middleware · charmbracelet/soft-serve@407c4ec · GitHub","mime":"text/html","httpstatus":"200","archivestatus":"404"},{"url":"https://github.com/charmbracelet/soft-serve/security/advisories/GHSA-mc97-99j4-vm2v","name":"https://github.com/charmbracelet/soft-serve/security/advisories/GHSA-mc97-99j4-vm2v","refsource":"MISC","tags":[],"title":"Soft Serve Public Key Authentication Bypass Vulnerability when Keyboard-Interactive SSH Authentication is Enabled · Advisory · charmbracelet/soft-serve · GitHub","mime":"text/html","httpstatus":"200","archivestatus":"404"},{"url":"https://www.cve.org/CVERecord?id=CVE-2023-43809","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2023-43809","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[{"cve_year":"2023","cve_id":"43809","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"a","cpe4":"charm","cpe5":"soft_serve","cpe6":"*","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"go","cpe12":"*","cpe13":"*"}],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"data_version":"4.0","data_type":"CVE","data_format":"MITRE","CVE_data_meta":{"ID":"CVE-2023-43809","ASSIGNER":"security-advisories@github.com","STATE":"PUBLIC"},"description":{"description_data":[{"lang":"eng","value":"Soft Serve is a self-hostable Git server for the command line. Prior to version 0.6.2, a security vulnerability in Soft Serve could allow an unauthenticated, remote attacker to bypass public key authentication when keyboard-interactive SSH authentication is active, through the `allow-keyless` setting, and the public key requires additional client-side verification for example using FIDO2 or GPG. This is due to insufficient validation procedures of the public key step during SSH request handshake, granting unauthorized access if the keyboard-interaction mode is utilized. An attacker could exploit this vulnerability by presenting manipulated SSH requests using keyboard-interactive authentication mode. This could potentially result in unauthorized access to the Soft Serve. Users should upgrade to the latest Soft Serve version `v0.6.2` to receive the patch for this issue. To workaround this vulnerability without upgrading, users can temporarily disable Keyboard-Interactive SSH Authentication using the `allow-keyless` setting."}]},"problemtype":{"problemtype_data":[{"description":[{"lang":"eng","value":"CWE-287: Improper Authentication","cweId":"CWE-287"}]}]},"affects":{"vendor":{"vendor_data":[{"vendor_name":"charmbracelet","product":{"product_data":[{"product_name":"soft-serve","version":{"version_data":[{"version_affected":"=","version_value":"< 0.6.2"}]}}]}}]}},"references":{"reference_data":[{"url":"https://github.com/charmbracelet/soft-serve/security/advisories/GHSA-mc97-99j4-vm2v","refsource":"MISC","name":"https://github.com/charmbracelet/soft-serve/security/advisories/GHSA-mc97-99j4-vm2v"},{"url":"https://github.com/charmbracelet/soft-serve/issues/389","refsource":"MISC","name":"https://github.com/charmbracelet/soft-serve/issues/389"},{"url":"https://github.com/charmbracelet/soft-serve/commit/407c4ec72d1006cee1ff8c1775e5bcc091c2bc89","refsource":"MISC","name":"https://github.com/charmbracelet/soft-serve/commit/407c4ec72d1006cee1ff8c1775e5bcc091c2bc89"},{"url":"https://github.com/charmbracelet/soft-serve/releases/tag/v0.6.2","refsource":"MISC","name":"https://github.com/charmbracelet/soft-serve/releases/tag/v0.6.2"}]},"source":{"advisory":"GHSA-mc97-99j4-vm2v","discovery":"UNKNOWN"},"impact":{"cvss":[{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":7.5,"baseSeverity":"HIGH","confidentialityImpact":"NONE","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","version":"3.1"}]}},"nvd":{"publishedDate":"2023-10-04 21:15:00","lastModifiedDate":"2023-10-10 20:12:00","problem_types":["CWE-287"],"metrics":{"baseMetricV3":{"cvssV3":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"NONE","availabilityImpact":"NONE","baseScore":7.5,"baseSeverity":"HIGH"},"exploitabilityScore":3.9,"impactScore":3.6}},"configurations":{"CVE_data_version":"4.0","nodes":[{"operator":"OR","children":[],"cpe_match":[{"vulnerable":true,"cpe23Uri":"cpe:2.3:a:charm:soft_serve:*:*:*:*:*:go:*:*","versionEndExcluding":"0.6.2","cpe_name":[]}]}]}},"legacy_mitre":{"record":null,"notes":[]}}}