{"id":"CVE-2021-26720","state":"PUBLISHED","title":"avahi-daemon-check-dns.sh in the Debian avahi package through 0.8-4 is executed as root via /etc/network/if-up.d/avahi-daemon, and allows a local attacker to cause a denial of serv","description":"avahi-daemon-check-dns.sh in the Debian avahi package through 0.8-4 is executed as root via /etc/network/if-up.d/avahi-daemon, and allows a local attacker to cause a denial of service or create arbitrary empty files via a symlink attack on files under /run/avahi-daemon. NOTE: this only affects the packaging for Debian GNU/Linux (used indirectly by SUSE), not the upstream Avahi product.","publishedAt":"2021-02-17T21:19:26.000Z","updatedAt":"2024-08-03T20:33:40.829Z","severity":null,"assigner":"mitre","products":["n/a n/a"],"affected":[{"vendor":"n/a","product":"n/a","versions":[{"version":"n/a","status":"affected"}]}],"references":["https://packages.debian.org/buster/avahi-daemon","https://packages.debian.org/sid/avahi-daemon","https://packages.debian.org/bullseye/avahi-daemon","https://security-tracker.debian.org/tracker/CVE-2021-26720","https://bugs.launchpad.net/ubuntu/+source/avahi/+bug/1870824","https://metadata.ftp-master.debian.org/changelogs/main/a/avahi/avahi_0.8-4_changelog","https://www.openwall.com/lists/oss-security/2021/02/15/2","https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=982796","https://bugzilla.suse.com/show_bug.cgi?id=1180827","https://lists.debian.org/debian-lts-announce/2022/06/msg00009.html"],"weaknesses":[],"ingestedAt":"2026-10-29T19:48:13.210Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2021/26xxx/CVE-2021-26720.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.1","cveMetadata":{"cveId":"CVE-2021-26720","state":"PUBLISHED","datePublished":"2021-02-17T21:19:26.000Z","dateUpdated":"2024-08-03T20:33:40.829Z","assignerShortName":"mitre","assignerOrgId":"8254265b-2729-46b6-b9e3-3dfca2d5bfca","dateReserved":"2021-02-05T00:00:00.000Z"},"containers":{"cna":{"descriptions":[{"lang":"en","value":"avahi-daemon-check-dns.sh in the Debian avahi package through 0.8-4 is executed as root via /etc/network/if-up.d/avahi-daemon, and allows a local attacker to cause a denial of service or create arbitrary empty files via a symlink attack on files under /run/avahi-daemon. NOTE: this only affects the packaging for Debian GNU/Linux (used indirectly by SUSE), not the upstream Avahi product."}],"affected":[{"vendor":"n/a","product":"n/a","versions":[{"version":"n/a","status":"affected"}]}],"references":[{"url":"https://packages.debian.org/buster/avahi-daemon","tags":["x_refsource_MISC"]},{"url":"https://packages.debian.org/sid/avahi-daemon","tags":["x_refsource_MISC"]},{"url":"https://packages.debian.org/bullseye/avahi-daemon","tags":["x_refsource_MISC"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2021-26720","tags":["x_refsource_MISC"]},{"url":"https://bugs.launchpad.net/ubuntu/+source/avahi/+bug/1870824","tags":["x_refsource_MISC"]},{"url":"https://metadata.ftp-master.debian.org/changelogs/main/a/avahi/avahi_0.8-4_changelog","tags":["x_refsource_MISC"]},{"url":"https://www.openwall.com/lists/oss-security/2021/02/15/2","tags":["x_refsource_MISC"]},{"url":"https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=982796","tags":["x_refsource_MISC"]},{"url":"https://bugzilla.suse.com/show_bug.cgi?id=1180827","tags":["x_refsource_MISC"]},{"url":"https://lists.debian.org/debian-lts-announce/2022/06/msg00009.html","name":"[debian-lts-announce] 20220607 [SECURITY] [DLA 3047-1] avahi security update","tags":["mailing-list","x_refsource_MLIST"]}],"problemTypes":[{"descriptions":[{"description":"n/a","lang":"en","type":"text"}]}],"providerMetadata":{"shortName":"mitre","dateUpdated":"2022-06-07T20:06:12.000Z","orgId":"8254265b-2729-46b6-b9e3-3dfca2d5bfca"},"x_legacyV4Record":{"CVE_data_meta":{"ASSIGNER":"cve@mitre.org","ID":"CVE-2021-26720","STATE":"PUBLIC"},"affects":{"vendor":{"vendor_data":[{"product":{"product_data":[{"product_name":"n/a","version":{"version_data":[{"version_value":"n/a"}]}}]},"vendor_name":"n/a"}]}},"data_format":"MITRE","data_type":"CVE","data_version":"4.0","description":{"description_data":[{"lang":"eng","value":"avahi-daemon-check-dns.sh in the Debian avahi package through 0.8-4 is executed as root via /etc/network/if-up.d/avahi-daemon, and allows a local attacker to cause a denial of service or create arbitrary empty files via a symlink attack on files under /run/avahi-daemon. NOTE: this only affects the packaging for Debian GNU/Linux (used indirectly by SUSE), not the upstream Avahi product."}]},"problemtype":{"problemtype_data":[{"description":[{"lang":"eng","value":"n/a"}]}]},"references":{"reference_data":[{"name":"https://packages.debian.org/buster/avahi-daemon","refsource":"MISC","url":"https://packages.debian.org/buster/avahi-daemon"},{"name":"https://packages.debian.org/sid/avahi-daemon","refsource":"MISC","url":"https://packages.debian.org/sid/avahi-daemon"},{"name":"https://packages.debian.org/bullseye/avahi-daemon","refsource":"MISC","url":"https://packages.debian.org/bullseye/avahi-daemon"},{"name":"https://security-tracker.debian.org/tracker/CVE-2021-26720","refsource":"MISC","url":"https://security-tracker.debian.org/tracker/CVE-2021-26720"},{"name":"https://bugs.launchpad.net/ubuntu/+source/avahi/+bug/1870824","refsource":"MISC","url":"https://bugs.launchpad.net/ubuntu/+source/avahi/+bug/1870824"},{"name":"https://metadata.ftp-master.debian.org/changelogs/main/a/avahi/avahi_0.8-4_changelog","refsource":"MISC","url":"https://metadata.ftp-master.debian.org/changelogs/main/a/avahi/avahi_0.8-4_changelog"},{"name":"https://www.openwall.com/lists/oss-security/2021/02/15/2","refsource":"MISC","url":"https://www.openwall.com/lists/oss-security/2021/02/15/2"},{"name":"https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=982796","refsource":"MISC","url":"https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=982796"},{"name":"https://bugzilla.suse.com/show_bug.cgi?id=1180827","refsource":"MISC","url":"https://bugzilla.suse.com/show_bug.cgi?id=1180827"},{"name":"[debian-lts-announce] 20220607 [SECURITY] [DLA 3047-1] avahi security update","refsource":"MLIST","url":"https://lists.debian.org/debian-lts-announce/2022/06/msg00009.html"}]}}},"adp":[{"title":"CVE Program Container","references":[{"url":"https://packages.debian.org/buster/avahi-daemon","tags":["x_refsource_MISC","x_transferred"]},{"url":"https://packages.debian.org/sid/avahi-daemon","tags":["x_refsource_MISC","x_transferred"]},{"url":"https://packages.debian.org/bullseye/avahi-daemon","tags":["x_refsource_MISC","x_transferred"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2021-26720","tags":["x_refsource_MISC","x_transferred"]},{"url":"https://bugs.launchpad.net/ubuntu/+source/avahi/+bug/1870824","tags":["x_refsource_MISC","x_transferred"]},{"url":"https://metadata.ftp-master.debian.org/changelogs/main/a/avahi/avahi_0.8-4_changelog","tags":["x_refsource_MISC","x_transferred"]},{"url":"https://www.openwall.com/lists/oss-security/2021/02/15/2","tags":["x_refsource_MISC","x_transferred"]},{"url":"https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=982796","tags":["x_refsource_MISC","x_transferred"]},{"url":"https://bugzilla.suse.com/show_bug.cgi?id=1180827","tags":["x_refsource_MISC","x_transferred"]},{"url":"https://lists.debian.org/debian-lts-announce/2022/06/msg00009.html","name":"[debian-lts-announce] 20220607 [SECURITY] [DLA 3047-1] avahi security update","tags":["mailing-list","x_refsource_MLIST","x_transferred"]}],"providerMetadata":{"shortName":"CVE","orgId":"af854a3a-2127-422b-91ae-364da2661108","dateUpdated":"2024-08-03T20:33:40.829Z"}}]}}}