{"answers":{"affected":"It affects 1 product.","exploited":"There is no known exploitation of CVE-2017-15887 in the wild and no public exploit code.","fix":"No fix has been published for CVE-2017-15887 yet. Limit exposure of the affected software until one is available.","what":"CVE-2017-15887 is a critical authentication bypass vulnerability in Synology CardDAV Server, published on 7 Nov 2017. An attacker can exploit it over the internet without logging in, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2017-15887 and fix it if it is affected.\n\nWhat it is: CVE-2017-15887 is a critical authentication bypass vulnerability in Synology CardDAV Server, published on 7 Nov 2017. An attacker can exploit it over the internet without logging in, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2017-15887 in the wild and no public exploit code.\n\nAffected product: Synology CardDAV Server. No package-level version data is available, so check the vendor advisory linked from the reference page.\n\nTask:\n1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.\n2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.\n3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.\n4. Run the tests and summarise what changed and why.\n5. If nothing in the project is affected, say so and change nothing.\n\nReference: https://insights.sbomify.com/CVE-2017-15887/ (Markdown: https://insights.sbomify.com/CVE-2017-15887/index.md)","id":"CVE-2017-15887","markdown":"https://insights.sbomify.com/CVE-2017-15887/index.md","name":"CVE-2017-15887","record":{"aliases":["GHSA-prqg-8whh-c62q"],"analysis":{"component_type":"server_software","fix_type":"upgrade","impacts":["account_takeover"],"network_reachable":"yes","non_default_config":false,"product_category":"Synology CardDAV Server","requires_auth":"none","summary":"Remote attackers can brute-force user credentials due to missing rate limiting on authentication attempts in Synology CardDAV Server.","user_interaction":"not_required","vuln_class":"auth_bypass"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"synology","cpe":[{"product":"carddav_server","vendor":"synology"}],"cvss":{"score":9.8,"severity":"critical","source":"nvd","vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","version":"3.0"},"cwes":[{"id":"CWE-307","name":"Improper Restriction of Excessive Authentication Attempts"}],"description":"An improper restriction of excessive authentication attempts vulnerability in /principals in Synology CardDAV Server before 6.0.7-0085 allows remote attackers to obtain user credentials via a brute-force attack.","ecosystems":[],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":null,"headline":"Auth bypass in Synology CardDAV Server","id":"CVE-2017-15887","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"auth_bypass","year":"2017"},"n_packages":0,"n_references":1,"next":{"headline":"Cross-site scripting in Synology Audio Station","id":"CVE-2017-15888"},"packages":[],"prev":{"headline":"Server-side request forgery in Chat","id":"CVE-2017-15886"},"products":["Synology CardDAV Server"],"published":"2017-11-07","related":[{"cvss_score":8.3,"headline":"SQL injection in CardDAV Server","id":"CVE-2022-27613","kev_date_added":null,"published":"2022-07-28"},{"cvss_score":6.5,"headline":"Cross-site scripting in CardDAV Server","id":"CVE-2018-8928","kev_date_added":null,"published":"2018-07-05"}],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"US public information, NVD API terms","name":"NVD"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":null,"exploitation":null,"technical_impact":null},"state":"PUBLISHED","updated":"2024-09-16","vendors":["Synology"]},"summary":"Remote attackers can brute-force user credentials due to missing rate limiting on authentication attempts in Synology CardDAV Server.","url":"https://insights.sbomify.com/CVE-2017-15887/"}