{"answers":{"affected":"2 open source packages ship an affected version, including ssddanbrown/bookstack. It affects 1 product.","exploited":"There is no known exploitation of CVE-2020-5256 in the wild and no public exploit code.","fix":"Upgrade ssddanbrown/bookstack to 0.25.5 or later.","what":"CVE-2020-5256 is a high-severity vulnerability in BookStackApp BookStack, published on 9 Mar 2020. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link."},"fix_prompt":"Check this codebase for CVE-2020-5256 and fix it if it is affected.\n\nWhat it is: CVE-2020-5256 is a high-severity vulnerability in BookStackApp BookStack, published on 9 Mar 2020. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.\nExploitation: There is no known exploitation of CVE-2020-5256 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- ssddanbrown/bookstack (Packagist): affected all versions; fixed in 0.25.5\n- ssddanbrown/bookstack (Packagist): affected all versions; fixed in 0.25.5\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-2020-5256/ (Markdown: https://insights.sbomify.com/CVE-2020-5256/index.md)","id":"CVE-2020-5256","markdown":"https://insights.sbomify.com/CVE-2020-5256/index.md","name":"CVE-2020-5256","record":{"aliases":["GHSA-g9rq-x4fj-f5hx"],"analysis":{"component_type":"web_application","fix_type":"upgrade","impacts":["code_execution"],"network_reachable":"yes","non_default_config":false,"product_category":"BookStack documentation platform","requires_auth":"low_privilege","summary":"Attackers can upload PHP files via image functions to execute remote code on the host system, affecting BookStack users.","user_interaction":"required","vuln_class":"file_upload"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[{"product":"bookstack","vendor":"bookstackapp"}],"cvss":{"score":7.9,"severity":"high","source":"cna","vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:L","version":"3.1"},"cwes":[{"id":"CWE-434","name":"Unrestricted Upload of File with Dangerous Type"},{"id":"CWE-95","name":"Improper Neutralization of Directives in Dynamically Evaluated Code"}],"description":"BookStack before version 0.25.5 has a vulnerability where a user could upload PHP files through image upload functions, which would allow them to execute code on the host system remotely. They would then have the permissions of the PHP process. This most impacts scenarios where non-trusted users are given permission to upload images in any area of the application. The issue was addressed in a series of patches in versions 0.25.3, 0.25.4 and 0.25.5. Users should upgrade to at least v0.25.5 to avoid this vulnerability.","ecosystems":["Packagist"],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":true,"headline":"Remote Code Execution Through Image Uploads in BookStack","id":"CVE-2020-5256","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"Packagist","product":null,"products":[],"type":"file_upload","year":"2020"},"n_packages":2,"n_references":4,"next":{"headline":"Sort order SQL injection in Administrate","id":"CVE-2020-5257"},"packages":[{"ecosystem":"Packagist","fixed":["0.25.5"],"introduced":["0"],"last_affected":[],"package":"ssddanbrown/bookstack","purl":null,"source":"GHSA-g9rq-x4fj-f5hx"},{"ecosystem":"Packagist","fixed":["0.25.5"],"introduced":["0"],"last_affected":[],"package":"ssddanbrown/bookstack","purl":"pkg:composer/ssddanbrown/bookstack","source":"GHSA-g9rq-x4fj-f5hx"}],"prev":{"headline":"Prevent cache poisoning via a Response Content-Type header","id":"CVE-2020-5255"},"products":["BookStack"],"published":"2020-03-09","related":[{"cvss_score":7.7,"headline":"Cross-Site Scripting in BookStack","id":"CVE-2020-26210","kev_date_added":null,"published":"2020-11-03"},{"cvss_score":7.7,"headline":"Cross-Site Scripting in BookStack","id":"CVE-2020-26211","kev_date_added":null,"published":"2020-11-03"},{"cvss_score":7.6,"headline":"Cross-site Scripting (XSS) - Stored in bookstackapp/bookstack","id":"CVE-2022-0877","kev_date_added":null,"published":"2022-03-08"},{"cvss_score":7.6,"headline":"Unrestricted Upload of File with Dangerous Type in bookstackapp/bookstack","id":"CVE-2021-3915","kev_date_added":null,"published":"2021-11-13"},{"cvss_score":6.5,"headline":"Book Stack v23.10.2 - LFR via Blind SSRF","id":"CVE-2023-6199","kev_date_added":null,"published":"2023-11-20"},{"cvss_score":6.5,"headline":"Improper Access Control in bookstackapp/bookstack","id":"CVE-2021-4026","kev_date_added":null,"published":"2021-11-30"}],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"CC BY 4.0","name":"GitHub Advisory Database","prefix":"GHSA"},{"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":"2024-08-04","vendors":["BookStackApp"]},"summary":"Attackers can upload PHP files via image functions to execute remote code on the host system, affecting BookStack users.","url":"https://insights.sbomify.com/CVE-2020-5256/"}