{"answers":{"affected":"It affects 1 product.","exploited":"There is no known exploitation of CVE-2021-26734 in the wild and no public exploit code.","fix":"No fix has been published for CVE-2021-26734 yet. Limit exposure of the affected software until one is available.","what":"CVE-2021-26734 is a medium-severity vulnerability in Zscaler Client Connector, published on 23 Oct 2023. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link."},"fix_prompt":"Check this codebase for CVE-2021-26734 and fix it if it is affected.\n\nWhat it is: CVE-2021-26734 is a medium-severity vulnerability in Zscaler Client Connector, published on 23 Oct 2023. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.\nExploitation: There is no known exploitation of CVE-2021-26734 in the wild and no public exploit code.\n\nAffected product: Zscaler Client Connector. 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-2021-26734/ (Markdown: https://insights.sbomify.com/CVE-2021-26734/index.md)","id":"CVE-2021-26734","markdown":"https://insights.sbomify.com/CVE-2021-26734/index.md","name":"CVE-2021-26734","record":{"aliases":["GHSA-r4fj-mm48-prvv"],"analysis":{"component_type":"desktop_application","fix_type":"upgrade","impacts":["privilege_escalation","data_modify"],"network_reachable":"adjacent_or_local","non_default_config":false,"product_category":"Zscaler Client Connector","requires_auth":"low_privilege","summary":"A local attacker can exploit improper junction handling during uninstallation to delete folders with elevated privileges, leading to privilege escalation.","user_interaction":"required","vuln_class":"privilege_escalation"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"Zscaler","cpe":[{"product":"client_connector","vendor":"zscaler"}],"cvss":{"score":4.4,"severity":"medium","source":"cna","vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:N/I:N/A:H","version":"3.1"},"cwes":[{"id":"CWE-269","name":"Improper Privilege Management"}],"description":"Zscaler Client Connector Installer on Windows before version 3.4.0.124 improperly handled directory junctions during uninstallation. A local adversary may be able to delete folders in an elevated context.","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":"Junction Delete leading to elevation of privilege","id":"CVE-2021-26734","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"privilege_escalation","year":"2021"},"n_packages":0,"n_references":1,"next":{"headline":"Untrusted Search Path While Executing REG DELETE by Uninstaller","id":"CVE-2021-26735"},"packages":[],"prev":{"headline":"spx_restservice FirstReset_handler_func Broken Access Control","id":"CVE-2021-26733"},"products":["Client Connector"],"published":"2023-10-23","related":[{"cvss_score":9.8,"headline":"Memory corruption in n/a","id":"CVE-2020-11633","kev_date_added":null,"published":"2021-07-15"},{"cvss_score":8.8,"headline":"Anti-Tampering bypass via Repair App functionality","id":"CVE-2024-23463","kev_date_added":null,"published":"2024-04-30"},{"cvss_score":8.2,"headline":"Linux ZCC allows unsigned updates, allowing elevated Code Execution","id":"CVE-2023-28804","kev_date_added":null,"published":"2023-10-23"},{"cvss_score":8.2,"headline":"Open redirect in Client Connector","id":"CVE-2023-28799","kev_date_added":null,"published":"2023-06-22"},{"cvss_score":8.1,"headline":"Output encoding missing in redrurl parameter","id":"CVE-2023-28800","kev_date_added":null,"published":"2023-06-22"},{"cvss_score":7.8,"headline":"Signature validation issue leads to Anti-Tampering bypass","id":"CVE-2024-23456","kev_date_added":null,"published":"2024-08-06"},{"cvss_score":7.8,"headline":"Anti-tampering can be disabled with uninstall password enforced","id":"CVE-2024-23457","kev_date_added":null,"published":"2024-05-01"}],"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":"no","exploitation":"none","technical_impact":"partial"},"state":"PUBLISHED","updated":"2024-09-17","vendors":["Zscaler"]},"summary":"A local attacker can exploit improper junction handling during uninstallation to delete folders with elevated privileges, leading to privilege escalation.","url":"https://insights.sbomify.com/CVE-2021-26734/"}