{"answers":{"affected":"It affects 2 products.","exploited":"There is no known exploitation of CVE-2018-6557 in the wild and no public exploit code.","fix":"Apply the vendor's patch.","what":"CVE-2018-6557 is a high-severity path traversal vulnerability in Canonical Ubuntu Linux, published on 21 Aug 2018. It can only be exploited from the same machine or local network, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2018-6557 and fix it if it is affected.\n\nWhat it is: CVE-2018-6557 is a high-severity path traversal vulnerability in Canonical Ubuntu Linux, published on 21 Aug 2018. It can only be exploited from the same machine or local network, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2018-6557 in the wild and no public exploit code.\n\nAffected product: Canonical Ubuntu Linux. 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-2018-6557/ (Markdown: https://insights.sbomify.com/CVE-2018-6557/index.md)","id":"CVE-2018-6557","markdown":"https://insights.sbomify.com/CVE-2018-6557/index.md","name":"CVE-2018-6557","record":{"aliases":["GHSA-vfrm-87wr-xvjf","UBUNTU-CVE-2018-6557","USN-3748-1"],"analysis":{"component_type":"operating_system","fix_type":"patch","impacts":["denial_of_service","privilege_escalation"],"network_reachable":"adjacent_or_local","non_default_config":true,"product_category":"Ubuntu base-files","requires_auth":"low_privilege","summary":"A local attacker can exploit insecure temporary file handling in the MOTD script to cause denial of service or escalate privileges if symlink restrictions are disabled.","user_interaction":"not_required","vuln_class":"path_traversal"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"canonical","cpe":[{"product":"base-files","vendor":"base-files_project"},{"product":"ubuntu_linux","vendor":"canonical"}],"cvss":{"score":7,"severity":"high","source":"nvd","vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H","version":"3.1"},"cwes":[{"id":"CWE-59","name":"Improper Link Resolution Before File Access"}],"description":"The MOTD update script in the base-files package in Ubuntu 18.04 LTS before 10.1ubuntu2.2, and Ubuntu 18.10 before 10.1ubuntu6 incorrectly handled temporary files. A local attacker could use this issue to cause a denial of service, or possibly escalate privileges if kernel symlink restrictions were disabled.","ecosystems":[],"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":"Insecure temporary file use in base-files","id":"CVE-2018-6557","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":"canonical:ubuntu_linux","products":["canonical:ubuntu_linux"],"type":"path_traversal","year":"2018"},"n_packages":0,"n_references":3,"next":{"headline":"Privilege Escalation in fscrypt","id":"CVE-2018-6558"},"packages":[],"prev":{"headline":"The lxc-user-nic component of LXC allows unprivileged users to open arbitrary files","id":"CVE-2018-6556"},"products":["base-files"],"published":"2018-08-21","related":[],"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":["Ubuntu"]},"summary":"A local attacker can exploit insecure temporary file handling in the MOTD script to cause denial of service or escalate privileges if symlink restrictions are disabled.","url":"https://insights.sbomify.com/CVE-2018-6557/"}