{"containers":{"cna":{"affected":[{"product":"zulip","vendor":"zulip","versions":[{"status":"affected","version":"< 4.7"}]}],"descriptions":[{"lang":"en","value":"Zulip is an open source team chat server. In affected versions Zulip allows organization administrators on a server to configure \"linkifiers\" that automatically create links from messages that users send, detected via arbitrary regular expressions. Malicious organization administrators could subject the server to a denial-of-service via regular expression complexity attacks; most simply, by configuring a quadratic-time regular expression in a linkifier, and sending messages that exploited it. A regular expression attempted to parse the user-provided regexes to verify that they were safe from ReDoS -- this was both insufficient, as well as _itself_ subject to ReDoS if the organization administrator entered a sufficiently complex invalid regex. Affected users should [upgrade to the just-released Zulip 4.7](https://zulip.readthedocs.io/en/latest/production/upgrade-or-modify.html#upgrading-to-a-release), or [`main`](https://zulip.readthedocs.io/en/latest/production/upgrade-or-modify.html#upgrading-from-a-git-repository)."}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"LOW","baseScore":4.3,"baseSeverity":"MEDIUM","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"LOW","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L","version":"3.1"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-400","description":"CWE-400: Uncontrolled Resource Consumption","lang":"en","type":"CWE"}]},{"descriptions":[{"cweId":"CWE-1333","description":"CWE-1333: Inefficient Regular Expression Complexity","lang":"en","type":"CWE"}]}],"providerMetadata":{"dateUpdated":"2021-10-07T22:20:13.000Z","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","shortName":"GitHub_M"},"references":[{"tags":["x_refsource_CONFIRM"],"url":"https://github.com/zulip/zulip/security/advisories/GHSA-4h36-mqfq-42jg"},{"tags":["x_refsource_MISC"],"url":"https://github.com/zulip/zulip/commit/e2d303c1bb5f538d17dc3d9134bc8858bdece781"},{"tags":["x_refsource_MISC"],"url":"https://securitylab.github.com/advisories/GHSL-2021-118-zulip-zulip/"}],"source":{"advisory":"GHSA-4h36-mqfq-42jg","discovery":"UNKNOWN"},"title":"Regular expression denial-of-service in Zulip","x_legacyV4Record":{"CVE_data_meta":{"ASSIGNER":"security-advisories@github.com","ID":"CVE-2021-41115","STATE":"PUBLIC","TITLE":"Regular expression denial-of-service in Zulip"},"affects":{"vendor":{"vendor_data":[{"product":{"product_data":[{"product_name":"zulip","version":{"version_data":[{"version_value":"< 4.7"}]}}]},"vendor_name":"zulip"}]}},"data_format":"MITRE","data_type":"CVE","data_version":"4.0","description":{"description_data":[{"lang":"eng","value":"Zulip is an open source team chat server. In affected versions Zulip allows organization administrators on a server to configure \"linkifiers\" that automatically create links from messages that users send, detected via arbitrary regular expressions. Malicious organization administrators could subject the server to a denial-of-service via regular expression complexity attacks; most simply, by configuring a quadratic-time regular expression in a linkifier, and sending messages that exploited it. A regular expression attempted to parse the user-provided regexes to verify that they were safe from ReDoS -- this was both insufficient, as well as _itself_ subject to ReDoS if the organization administrator entered a sufficiently complex invalid regex. Affected users should [upgrade to the just-released Zulip 4.7](https://zulip.readthedocs.io/en/latest/production/upgrade-or-modify.html#upgrading-to-a-release), or [`main`](https://zulip.readthedocs.io/en/latest/production/upgrade-or-modify.html#upgrading-from-a-git-repository)."}]},"impact":{"cvss":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"LOW","baseScore":4.3,"baseSeverity":"MEDIUM","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"LOW","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L","version":"3.1"}},"problemtype":{"problemtype_data":[{"description":[{"lang":"eng","value":"CWE-400: Uncontrolled Resource Consumption"}]},{"description":[{"lang":"eng","value":"CWE-1333: Inefficient Regular Expression Complexity"}]}]},"references":{"reference_data":[{"name":"https://github.com/zulip/zulip/security/advisories/GHSA-4h36-mqfq-42jg","refsource":"CONFIRM","url":"https://github.com/zulip/zulip/security/advisories/GHSA-4h36-mqfq-42jg"},{"name":"https://github.com/zulip/zulip/commit/e2d303c1bb5f538d17dc3d9134bc8858bdece781","refsource":"MISC","url":"https://github.com/zulip/zulip/commit/e2d303c1bb5f538d17dc3d9134bc8858bdece781"},{"name":"https://securitylab.github.com/advisories/GHSL-2021-118-zulip-zulip/","refsource":"MISC","url":"https://securitylab.github.com/advisories/GHSL-2021-118-zulip-zulip/"}]},"source":{"advisory":"GHSA-4h36-mqfq-42jg","discovery":"UNKNOWN"}}},"adp":[{"providerMetadata":{"orgId":"af854a3a-2127-422b-91ae-364da2661108","shortName":"CVE","dateUpdated":"2024-08-04T02:59:31.570Z"},"title":"CVE Program Container","references":[{"tags":["x_refsource_CONFIRM","x_transferred"],"url":"https://github.com/zulip/zulip/security/advisories/GHSA-4h36-mqfq-42jg"},{"tags":["x_refsource_MISC","x_transferred"],"url":"https://github.com/zulip/zulip/commit/e2d303c1bb5f538d17dc3d9134bc8858bdece781"},{"tags":["x_refsource_MISC","x_transferred"],"url":"https://securitylab.github.com/advisories/GHSL-2021-118-zulip-zulip/"}]}]},"cveMetadata":{"assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","assignerShortName":"GitHub_M","cveId":"CVE-2021-41115","datePublished":"2021-10-07T22:20:13.000Z","dateReserved":"2021-09-15T00:00:00.000Z","dateUpdated":"2024-08-04T02:59:31.570Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.1"}