fkie_cve-2021-26720
Vulnerability from fkie_nvd
Published
2021-02-17 22:15
Modified
2024-11-21 05:56
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
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.
References
cve@mitre.orghttps://bugs.debian.org/cgi-bin/bugreport.cgi?bug=982796Mailing List, Third Party Advisory
cve@mitre.orghttps://bugs.launchpad.net/ubuntu/+source/avahi/+bug/1870824Issue Tracking, Third Party Advisory
cve@mitre.orghttps://bugzilla.suse.com/show_bug.cgi?id=1180827Issue Tracking, Third Party Advisory
cve@mitre.orghttps://lists.debian.org/debian-lts-announce/2022/06/msg00009.htmlMailing List, Third Party Advisory
cve@mitre.orghttps://metadata.ftp-master.debian.org/changelogs/main/a/avahi/avahi_0.8-4_changelogBroken Link, Third Party Advisory
cve@mitre.orghttps://packages.debian.org/bullseye/avahi-daemonProduct, Third Party Advisory
cve@mitre.orghttps://packages.debian.org/buster/avahi-daemonProduct, Third Party Advisory
cve@mitre.orghttps://packages.debian.org/sid/avahi-daemonProduct, Third Party Advisory
cve@mitre.orghttps://security-tracker.debian.org/tracker/CVE-2021-26720Third Party Advisory
cve@mitre.orghttps://www.openwall.com/lists/oss-security/2021/02/15/2Mailing List, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=982796Mailing List, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://bugs.launchpad.net/ubuntu/+source/avahi/+bug/1870824Issue Tracking, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://bugzilla.suse.com/show_bug.cgi?id=1180827Issue Tracking, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://lists.debian.org/debian-lts-announce/2022/06/msg00009.htmlMailing List, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://metadata.ftp-master.debian.org/changelogs/main/a/avahi/avahi_0.8-4_changelogBroken Link, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://packages.debian.org/bullseye/avahi-daemonProduct, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://packages.debian.org/buster/avahi-daemonProduct, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://packages.debian.org/sid/avahi-daemonProduct, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://security-tracker.debian.org/tracker/CVE-2021-26720Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://www.openwall.com/lists/oss-security/2021/02/15/2Mailing List, Third Party Advisory
Impacted products
Vendor Product Version
avahi avahi *
debian debian_linux 9.0
debian debian_linux 10.0


To clipboard 

{
   configurations: [
      {
         nodes: [
            {
               cpeMatch: [
                  {
                     criteria: "cpe:2.3:a:avahi:avahi:*:*:*:*:*:*:*:*",
                     matchCriteriaId: "7960274F-0D6F-4054-8236-145A6430B6CE",
                     versionEndIncluding: "0.8-4",
                     vulnerable: true,
                  },
               ],
               negate: false,
               operator: "OR",
            },
         ],
      },
      {
         nodes: [
            {
               cpeMatch: [
                  {
                     criteria: "cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*",
                     matchCriteriaId: "DEECE5FC-CACF-4496-A3E7-164736409252",
                     vulnerable: true,
                  },
                  {
                     criteria: "cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*",
                     matchCriteriaId: "07B237A9-69A3-4A9C-9DA0-4E06BD37AE73",
                     vulnerable: true,
                  },
               ],
               negate: false,
               operator: "OR",
            },
         ],
      },
   ],
   cveTags: [],
   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.",
      },
      {
         lang: "es",
         value: "El archivo avahi-daemon-check-dns.sh en el paquete Debian avahi a versiones hasta 0.8-4, es ejecutado como root por medio de /etc/network/if-up.d/avahi-daemon, y permite a un atacante local causar una denegación de servicio o crear archivos vacíos arbitrarios por medio de un ataque de tipo symlink en archivos bajo /run/avahi-daemon. NOTA: esto solo afecta al empaquetado de Debian GNU/Linux (usado indirectamente por SUSE), no al producto de Avahi previo",
      },
   ],
   id: "CVE-2021-26720",
   lastModified: "2024-11-21T05:56:44.693",
   metrics: {
      cvssMetricV2: [
         {
            acInsufInfo: false,
            baseSeverity: "MEDIUM",
            cvssData: {
               accessComplexity: "LOW",
               accessVector: "LOCAL",
               authentication: "NONE",
               availabilityImpact: "PARTIAL",
               baseScore: 4.6,
               confidentialityImpact: "PARTIAL",
               integrityImpact: "PARTIAL",
               vectorString: "AV:L/AC:L/Au:N/C:P/I:P/A:P",
               version: "2.0",
            },
            exploitabilityScore: 3.9,
            impactScore: 6.4,
            obtainAllPrivilege: false,
            obtainOtherPrivilege: false,
            obtainUserPrivilege: false,
            source: "nvd@nist.gov",
            type: "Primary",
            userInteractionRequired: false,
         },
      ],
      cvssMetricV31: [
         {
            cvssData: {
               attackComplexity: "LOW",
               attackVector: "LOCAL",
               availabilityImpact: "HIGH",
               baseScore: 7.8,
               baseSeverity: "HIGH",
               confidentialityImpact: "HIGH",
               integrityImpact: "HIGH",
               privilegesRequired: "LOW",
               scope: "UNCHANGED",
               userInteraction: "NONE",
               vectorString: "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
               version: "3.1",
            },
            exploitabilityScore: 1.8,
            impactScore: 5.9,
            source: "nvd@nist.gov",
            type: "Primary",
         },
      ],
   },
   published: "2021-02-17T22:15:12.710",
   references: [
      {
         source: "cve@mitre.org",
         tags: [
            "Mailing List",
            "Third Party Advisory",
         ],
         url: "https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=982796",
      },
      {
         source: "cve@mitre.org",
         tags: [
            "Issue Tracking",
            "Third Party Advisory",
         ],
         url: "https://bugs.launchpad.net/ubuntu/+source/avahi/+bug/1870824",
      },
      {
         source: "cve@mitre.org",
         tags: [
            "Issue Tracking",
            "Third Party Advisory",
         ],
         url: "https://bugzilla.suse.com/show_bug.cgi?id=1180827",
      },
      {
         source: "cve@mitre.org",
         tags: [
            "Mailing List",
            "Third Party Advisory",
         ],
         url: "https://lists.debian.org/debian-lts-announce/2022/06/msg00009.html",
      },
      {
         source: "cve@mitre.org",
         tags: [
            "Broken Link",
            "Third Party Advisory",
         ],
         url: "https://metadata.ftp-master.debian.org/changelogs/main/a/avahi/avahi_0.8-4_changelog",
      },
      {
         source: "cve@mitre.org",
         tags: [
            "Product",
            "Third Party Advisory",
         ],
         url: "https://packages.debian.org/bullseye/avahi-daemon",
      },
      {
         source: "cve@mitre.org",
         tags: [
            "Product",
            "Third Party Advisory",
         ],
         url: "https://packages.debian.org/buster/avahi-daemon",
      },
      {
         source: "cve@mitre.org",
         tags: [
            "Product",
            "Third Party Advisory",
         ],
         url: "https://packages.debian.org/sid/avahi-daemon",
      },
      {
         source: "cve@mitre.org",
         tags: [
            "Third Party Advisory",
         ],
         url: "https://security-tracker.debian.org/tracker/CVE-2021-26720",
      },
      {
         source: "cve@mitre.org",
         tags: [
            "Mailing List",
            "Third Party Advisory",
         ],
         url: "https://www.openwall.com/lists/oss-security/2021/02/15/2",
      },
      {
         source: "af854a3a-2127-422b-91ae-364da2661108",
         tags: [
            "Mailing List",
            "Third Party Advisory",
         ],
         url: "https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=982796",
      },
      {
         source: "af854a3a-2127-422b-91ae-364da2661108",
         tags: [
            "Issue Tracking",
            "Third Party Advisory",
         ],
         url: "https://bugs.launchpad.net/ubuntu/+source/avahi/+bug/1870824",
      },
      {
         source: "af854a3a-2127-422b-91ae-364da2661108",
         tags: [
            "Issue Tracking",
            "Third Party Advisory",
         ],
         url: "https://bugzilla.suse.com/show_bug.cgi?id=1180827",
      },
      {
         source: "af854a3a-2127-422b-91ae-364da2661108",
         tags: [
            "Mailing List",
            "Third Party Advisory",
         ],
         url: "https://lists.debian.org/debian-lts-announce/2022/06/msg00009.html",
      },
      {
         source: "af854a3a-2127-422b-91ae-364da2661108",
         tags: [
            "Broken Link",
            "Third Party Advisory",
         ],
         url: "https://metadata.ftp-master.debian.org/changelogs/main/a/avahi/avahi_0.8-4_changelog",
      },
      {
         source: "af854a3a-2127-422b-91ae-364da2661108",
         tags: [
            "Product",
            "Third Party Advisory",
         ],
         url: "https://packages.debian.org/bullseye/avahi-daemon",
      },
      {
         source: "af854a3a-2127-422b-91ae-364da2661108",
         tags: [
            "Product",
            "Third Party Advisory",
         ],
         url: "https://packages.debian.org/buster/avahi-daemon",
      },
      {
         source: "af854a3a-2127-422b-91ae-364da2661108",
         tags: [
            "Product",
            "Third Party Advisory",
         ],
         url: "https://packages.debian.org/sid/avahi-daemon",
      },
      {
         source: "af854a3a-2127-422b-91ae-364da2661108",
         tags: [
            "Third Party Advisory",
         ],
         url: "https://security-tracker.debian.org/tracker/CVE-2021-26720",
      },
      {
         source: "af854a3a-2127-422b-91ae-364da2661108",
         tags: [
            "Mailing List",
            "Third Party Advisory",
         ],
         url: "https://www.openwall.com/lists/oss-security/2021/02/15/2",
      },
   ],
   sourceIdentifier: "cve@mitre.org",
   vulnStatus: "Modified",
   weaknesses: [
      {
         description: [
            {
               lang: "en",
               value: "CWE-59",
            },
         ],
         source: "nvd@nist.gov",
         type: "Primary",
      },
   ],
}


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