{"id":"CVE-2021-32635","state":"PUBLISHED","title":"Action Commands (run/shell/exec) Against Library URIs Ignore Configured Remote Endpoint","description":"Singularity is an open source container platform. In verions 3.7.2 and 3.7.3, Dde to incorrect use of a default URL, `singularity` action commands (`run`/`shell`/`exec`) specifying a container using a `library://` URI will always attempt to retrieve the container from the default remote endpoint (`cloud.sylabs.io`) rather than the configured remote endpoint. An attacker may be able to push a malicious container to the default remote endpoint with a URI that is identical to the URI used by a victim with a non-default remote endpoint, thus executing the malicious container. Only action commands (`run`/`shell`/`exec`) against `library://` URIs are affected. Other commands such as `pull` / `push` respect the configured remote endpoint. The vulnerability is patched in Singularity version 3.7.4. Two possible workarounds exist: Users can only interact with the default remote endpoint, or an installation can have an execution control list configured to restrict execution to containers signed with specific secure keys.","publishedAt":"2021-05-28T20:20:12.000Z","updatedAt":"2024-08-03T23:25:31.038Z","severity":{"score":6.3,"label":"Medium","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L","source":"GitHub_M"},"assigner":"GitHub_M","products":["sylabs singularity"],"affected":[{"vendor":"sylabs","product":"singularity","versions":[{"version":">= 3.7.2, <= 3.7.3","status":"affected"}]}],"references":["https://github.com/sylabs/singularity/security/advisories/GHSA-5mv9-q7fq-9394","https://github.com/sylabs/singularity/releases/tag/v3.7.4","https://security.gentoo.org/glsa/202107-50"],"weaknesses":["CWE-923","CWE-20"],"ingestedAt":"2026-10-29T19:48:33.225Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2021/32xxx/CVE-2021-32635.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.1","cveMetadata":{"cveId":"CVE-2021-32635","state":"PUBLISHED","datePublished":"2021-05-28T20:20:12.000Z","dateUpdated":"2024-08-03T23:25:31.038Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2021-05-12T00:00:00.000Z"},"containers":{"cna":{"title":"Action Commands (run/shell/exec) Against Library URIs Ignore Configured Remote Endpoint","descriptions":[{"lang":"en","value":"Singularity is an open source container platform. In verions 3.7.2 and 3.7.3, Dde to incorrect use of a default URL, `singularity` action commands (`run`/`shell`/`exec`) specifying a container using a `library://` URI will always attempt to retrieve the container from the default remote endpoint (`cloud.sylabs.io`) rather than the configured remote endpoint. An attacker may be able to push a malicious container to the default remote endpoint with a URI that is identical to the URI used by a victim with a non-default remote endpoint, thus executing the malicious container. Only action commands (`run`/`shell`/`exec`) against `library://` URIs are affected. Other commands such as `pull` / `push` respect the configured remote endpoint. The vulnerability is patched in Singularity version 3.7.4. Two possible workarounds exist: Users can only interact with the default remote endpoint, or an installation can have an execution control list configured to restrict execution to containers signed with specific secure keys."}],"affected":[{"vendor":"sylabs","product":"singularity","versions":[{"version":">= 3.7.2, <= 3.7.3","status":"affected"}]}],"references":[{"url":"https://github.com/sylabs/singularity/security/advisories/GHSA-5mv9-q7fq-9394","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/sylabs/singularity/releases/tag/v3.7.4","tags":["x_refsource_MISC"]},{"url":"https://security.gentoo.org/glsa/202107-50","name":"GLSA-202107-50","tags":["vendor-advisory","x_refsource_GENTOO"]}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"LOW","baseScore":6.3,"baseSeverity":"MEDIUM","confidentialityImpact":"LOW","integrityImpact":"LOW","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"REQUIRED","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L","version":"3.1"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-923","description":"CWE-923: Improper Restriction of Communication Channel to Intended Endpoints","lang":"en","type":"CWE"}]},{"descriptions":[{"cweId":"CWE-20","description":"CWE-20 Improper Input Validation","lang":"en","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","dateUpdated":"2021-07-22T06:06:44.000Z","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa"},"source":{"advisory":"GHSA-5mv9-q7fq-9394","discovery":"UNKNOWN"},"x_legacyV4Record":{"CVE_data_meta":{"ASSIGNER":"security-advisories@github.com","ID":"CVE-2021-32635","STATE":"PUBLIC","TITLE":"Action Commands (run/shell/exec) Against Library URIs Ignore Configured Remote Endpoint"},"affects":{"vendor":{"vendor_data":[{"product":{"product_data":[{"product_name":"singularity","version":{"version_data":[{"version_value":">= 3.7.2, <= 3.7.3"}]}}]},"vendor_name":"sylabs"}]}},"data_format":"MITRE","data_type":"CVE","data_version":"4.0","description":{"description_data":[{"lang":"eng","value":"Singularity is an open source container platform. In verions 3.7.2 and 3.7.3, Dde to incorrect use of a default URL, `singularity` action commands (`run`/`shell`/`exec`) specifying a container using a `library://` URI will always attempt to retrieve the container from the default remote endpoint (`cloud.sylabs.io`) rather than the configured remote endpoint. An attacker may be able to push a malicious container to the default remote endpoint with a URI that is identical to the URI used by a victim with a non-default remote endpoint, thus executing the malicious container. Only action commands (`run`/`shell`/`exec`) against `library://` URIs are affected. Other commands such as `pull` / `push` respect the configured remote endpoint. The vulnerability is patched in Singularity version 3.7.4. Two possible workarounds exist: Users can only interact with the default remote endpoint, or an installation can have an execution control list configured to restrict execution to containers signed with specific secure keys."}]},"impact":{"cvss":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"LOW","baseScore":6.3,"baseSeverity":"MEDIUM","confidentialityImpact":"LOW","integrityImpact":"LOW","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"REQUIRED","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L","version":"3.1"}},"problemtype":{"problemtype_data":[{"description":[{"lang":"eng","value":"CWE-923: Improper Restriction of Communication Channel to Intended Endpoints"}]},{"description":[{"lang":"eng","value":"CWE-20 Improper Input Validation"}]}]},"references":{"reference_data":[{"name":"https://github.com/sylabs/singularity/security/advisories/GHSA-5mv9-q7fq-9394","refsource":"CONFIRM","url":"https://github.com/sylabs/singularity/security/advisories/GHSA-5mv9-q7fq-9394"},{"name":"https://github.com/sylabs/singularity/releases/tag/v3.7.4","refsource":"MISC","url":"https://github.com/sylabs/singularity/releases/tag/v3.7.4"},{"name":"GLSA-202107-50","refsource":"GENTOO","url":"https://security.gentoo.org/glsa/202107-50"}]},"source":{"advisory":"GHSA-5mv9-q7fq-9394","discovery":"UNKNOWN"}}},"adp":[{"title":"CVE Program Container","references":[{"url":"https://github.com/sylabs/singularity/security/advisories/GHSA-5mv9-q7fq-9394","tags":["x_refsource_CONFIRM","x_transferred"]},{"url":"https://github.com/sylabs/singularity/releases/tag/v3.7.4","tags":["x_refsource_MISC","x_transferred"]},{"url":"https://security.gentoo.org/glsa/202107-50","name":"GLSA-202107-50","tags":["vendor-advisory","x_refsource_GENTOO","x_transferred"]}],"providerMetadata":{"shortName":"CVE","orgId":"af854a3a-2127-422b-91ae-364da2661108","dateUpdated":"2024-08-03T23:25:31.038Z"}}]}}}