{"id":"CVE-2023-43809","state":"PUBLISHED","title":"Soft Serve Public Key Authentication Bypass Vulnerability when Keyboard-Interactive SSH Authentication is Enabled","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.","publishedAt":"2023-10-04T20:40:41.822Z","updatedAt":"2024-09-20T14:51:49.413Z","severity":{"score":7.5,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","source":"GitHub_M"},"assigner":"GitHub_M","products":["charmbracelet soft-serve"],"affected":[{"vendor":"charmbracelet","product":"soft-serve","versions":[{"version":"< 0.6.2","status":"affected"}]}],"references":["https://github.com/charmbracelet/soft-serve/security/advisories/GHSA-mc97-99j4-vm2v","https://github.com/charmbracelet/soft-serve/issues/389","https://github.com/charmbracelet/soft-serve/commit/407c4ec72d1006cee1ff8c1775e5bcc091c2bc89","https://github.com/charmbracelet/soft-serve/releases/tag/v0.6.2"],"weaknesses":["CWE-287"],"ingestedAt":"2026-10-29T20:06:17.512Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2023/43xxx/CVE-2023-43809.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.1","cveMetadata":{"cveId":"CVE-2023-43809","state":"PUBLISHED","datePublished":"2023-10-04T20:40:41.822Z","dateUpdated":"2024-09-20T14:51:49.413Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2023-09-22T14:51:42.341Z"},"containers":{"cna":{"title":"Soft Serve Public Key Authentication Bypass Vulnerability when Keyboard-Interactive SSH Authentication is Enabled","descriptions":[{"lang":"en","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."}],"affected":[{"vendor":"charmbracelet","product":"soft-serve","versions":[{"version":"< 0.6.2","status":"affected"}]}],"references":[{"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","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/charmbracelet/soft-serve/issues/389","name":"https://github.com/charmbracelet/soft-serve/issues/389","tags":["x_refsource_MISC"]},{"url":"https://github.com/charmbracelet/soft-serve/commit/407c4ec72d1006cee1ff8c1775e5bcc091c2bc89","name":"https://github.com/charmbracelet/soft-serve/commit/407c4ec72d1006cee1ff8c1775e5bcc091c2bc89","tags":["x_refsource_MISC"]},{"url":"https://github.com/charmbracelet/soft-serve/releases/tag/v0.6.2","name":"https://github.com/charmbracelet/soft-serve/releases/tag/v0.6.2","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV3_1":{"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"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-287","lang":"en","description":"CWE-287: Improper Authentication","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2023-10-04T20:40:41.822Z"},"source":{"advisory":"GHSA-mc97-99j4-vm2v","discovery":"UNKNOWN"}},"adp":[{"title":"CVE Program Container","references":[{"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","tags":["x_refsource_CONFIRM","x_transferred"]},{"url":"https://github.com/charmbracelet/soft-serve/issues/389","name":"https://github.com/charmbracelet/soft-serve/issues/389","tags":["x_refsource_MISC","x_transferred"]},{"url":"https://github.com/charmbracelet/soft-serve/commit/407c4ec72d1006cee1ff8c1775e5bcc091c2bc89","name":"https://github.com/charmbracelet/soft-serve/commit/407c4ec72d1006cee1ff8c1775e5bcc091c2bc89","tags":["x_refsource_MISC","x_transferred"]},{"url":"https://github.com/charmbracelet/soft-serve/releases/tag/v0.6.2","name":"https://github.com/charmbracelet/soft-serve/releases/tag/v0.6.2","tags":["x_refsource_MISC","x_transferred"]}],"providerMetadata":{"shortName":"CVE","orgId":"af854a3a-2127-422b-91ae-364da2661108","dateUpdated":"2024-08-02T19:52:11.366Z"}},{"title":"CISA ADP Vulnrichment","affected":[{"vendor":"charmbracelet","product":"soft-serve","defaultStatus":"unknown","versions":[{"version":"0","status":"affected","lessThan":"0.6.2","versionType":"custom"}],"cpes":["cpe:2.3:a:charmbracelet:soft-serve:*:*:*:*:*:*:*:*"]}],"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2024-09-19T18:37:09.312902Z","id":"CVE-2023-43809","options":[{"Exploitation":"poc"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2024-09-20T14:51:49.413Z"}}]}}}