{"document":{"acknowledgments":[{"organization":"CERT@VDE","summary":"coordination","urls":["https://certvde.com"]}],"category":"csaf_security_advisory","csaf_version":"2.0","distribution":{"tlp":{"label":"WHITE","url":"https://www.first.org/tlp/"}},"lang":"en-GB","notes":[{"category":"summary","text":"Multiple issues have been identified in dnsmasq < 2.83","title":"Summary"},{"category":"description","text":"Please see the CVE-IDs for details.","title":"Impact"},{"category":"description","text":"Update to the following versions:\n\n| Product            | Fixed Version |\n|--------------------|-------------------|\n| mbNET/mbNET .rokey | >= 7.0.0         |\n| mbNET HW1         | >= 5.1.11         |\n","title":"Remediation"}],"publisher":{"category":"vendor","contact_details":"security-team@mbconnectline.de","name":"MB connect line GmbH","namespace":"https://mbconnectline.com"},"references":[{"category":"external","summary":"MB connect line advisory overview at CERT@VDE","url":"https://certvde.com/en/advisories/vendor/mbconnectline/"},{"category":"self","summary":"VDE-2021-012: MB connect line: multiple products partially affected by DNSpooq - HTML","url":"https://certvde.com/en/advisories/VDE-2021-012"},{"category":"self","summary":"VDE-2021-012: MB connect line: multiple products partially affected by DNSpooq - CSAF","url":"https://mbconnectline.csaf-tp.certvde.com/.well-known/csaf/white/2021/vde-2021-012.json"}],"title":"MB connect line: multiple products partially affected by DNSpooq","tracking":{"aliases":["VDE-2021-012"],"current_release_date":"2025-05-14T12:28:19.000Z","generator":{"date":"2025-02-10T13:47:32.328Z","engine":{"name":"Secvisogram","version":"2.5.18"}},"id":"VDE-2021-012","initial_release_date":"2021-04-26T08:04:00.000Z","revision_history":[{"date":"2021-04-26T08:04:00.000Z","number":"1","summary":"Initial revision."},{"date":"2025-05-14T12:28:19.000Z","number":"2","summary":"Fix: version space"}],"status":"final","version":"2"}},"product_tree":{"branches":[{"branches":[{"branches":[{"branches":[{"category":"product_version_range","name":"<=5.1.10","product":{"name":"mbNET HW1 <=5.1.10","product_id":"CSAFPID-51001"}},{"category":"product_version","name":"5.1.11","product":{"name":"mbNET HW1 5.1.11","product_id":"CSAFPID-52001"}}],"category":"product_name","name":"mbNET HW1"},{"branches":[{"category":"product_version_range","name":"<=6.2.5","product":{"name":"mbNET/mbNET .rokey <=6.2.5","product_id":"CSAFPID-51002"}},{"category":"product_version","name":"7.0.0","product":{"name":"mbNET/mbNET .rokey 7.0.0","product_id":"CSAFPID-52002"}}],"category":"product_name","name":"mbNET/mbNET .rokey"}],"category":"product_family","name":"Software"}],"category":"vendor","name":"MB connect line"}],"product_groups":[{"group_id":"CSAFGID-0001","product_ids":["CSAFPID-51001","CSAFPID-51002"],"summary":"affected products"},{"group_id":"CSAFGID-0002","product_ids":["CSAFPID-52001","CSAFPID-52002"],"summary":"fixed products"}]},"vulnerabilities":[{"cve":"CVE-2020-25684","cwe":{"id":"CWE-358","name":"Improperly Implemented Security Check for Standard"},"notes":[{"category":"description","text":"A flaw was found in dnsmasq before version 2.83. When getting a reply from a forwarded query, dnsmasq checks in the forward.c:reply_query() if the reply destination address/port is used by the pending forwarded queries. However, it does not use the address/port to retrieve the exact forwarded query, substantially reducing the number of attempts an attacker on the network would have to perform to forge a reply and get it accepted by dnsmasq. This issue contrasts with RFC5452, which specifies a query's attributes that all must be used to match a reply. This flaw allows an attacker to perform a DNS Cache Poisoning attack. If chained with CVE-2020-25685 or CVE-2020-25686, the attack complexity of a successful attack is reduced. The highest threat from this vulnerability is to data integrity.","title":"Vulnerability Description"}],"product_status":{"fixed":["CSAFPID-52001","CSAFPID-52002"],"known_affected":["CSAFPID-51001","CSAFPID-51002"]},"remediations":[{"category":"vendor_fix","details":"Update to the following versions:\n\n| Product            | Fixed Version |\n|--------------------|-------------------|\n| mbNET/mbNET .rokey | >= 7.0.0         |\n| mbNET HW1         | >= 5.1.11         |\n","group_ids":["CSAFGID-0001"]}],"scores":[{"cvss_v3":{"attackComplexity":"HIGH","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":3.7,"baseSeverity":"LOW","confidentialityImpact":"NONE","environmentalScore":3.7,"environmentalSeverity":"LOW","integrityImpact":"LOW","privilegesRequired":"NONE","scope":"UNCHANGED","temporalScore":3.7,"temporalSeverity":"LOW","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N","version":"3.1"},"products":["CSAFPID-51001","CSAFPID-51002"]}],"title":"CVE-2020-25684"},{"cve":"CVE-2020-25685","cwe":{"id":"CWE-326","name":"Inadequate Encryption Strength"},"notes":[{"category":"description","text":"A flaw was found in dnsmasq before version 2.83. When getting a reply from a forwarded query, dnsmasq checks in forward.c:reply_query(), which is the forwarded query that matches the reply, by only using a weak hash of the query name. Due to the weak hash (CRC32 when dnsmasq is compiled without DNSSEC, SHA-1 when it is) this flaw allows an off-path attacker to find several different domains all having the same hash, substantially reducing the number of attempts they would have to perform to forge a reply and get it accepted by dnsmasq. This is in contrast with RFC5452, which specifies that the query name is one of the attributes of a query that must be used to match a reply. This flaw could be abused to perform a DNS Cache Poisoning attack. If chained with CVE-2020-25684 the attack complexity of a successful attack is reduced. The highest threat from this vulnerability is to data integrity.","title":"Vulnerability Description"}],"product_status":{"fixed":["CSAFPID-52001","CSAFPID-52002"],"known_affected":["CSAFPID-51001","CSAFPID-51002"]},"remediations":[{"category":"vendor_fix","details":"Update to the following versions:\n\n| Product            | Fixed Version |\n|--------------------|-------------------|\n| mbNET/mbNET .rokey | >= 7.0.0         |\n| mbNET HW1         | >= 5.1.11         |\n","group_ids":["CSAFGID-0001"]}],"scores":[{"cvss_v3":{"attackComplexity":"HIGH","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":3.7,"baseSeverity":"LOW","confidentialityImpact":"NONE","environmentalScore":3.7,"environmentalSeverity":"LOW","integrityImpact":"LOW","privilegesRequired":"NONE","scope":"UNCHANGED","temporalScore":3.7,"temporalSeverity":"LOW","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N","version":"3.1"},"products":["CSAFPID-51001","CSAFPID-51002"]}],"title":"CVE-2020-25685"},{"cve":"CVE-2020-25686","cwe":{"id":"CWE-358","name":"Improperly Implemented Security Check for Standard"},"notes":[{"category":"description","text":"A flaw was found in dnsmasq before version 2.83. When receiving a query, dnsmasq does not check for an existing pending request for the same name and forwards a new request. By default, a maximum of 150 pending queries can be sent to upstream servers, so there can be at most 150 queries for the same name. This flaw allows an off-path attacker on the network to substantially reduce the number of attempts that it would have to perform to forge a reply and have it accepted by dnsmasq. This issue is mentioned in the \"Birthday Attacks\" section of RFC5452. If chained with CVE-2020-25684, the attack complexity of a successful attack is reduced. The highest threat from this vulnerability is to data integrity.","title":"Vulnerability Description"}],"product_status":{"fixed":["CSAFPID-52001","CSAFPID-52002"],"known_affected":["CSAFPID-51001","CSAFPID-51002"]},"remediations":[{"category":"vendor_fix","details":"Update to the following versions:\n\n| Product            | Fixed Version |\n|--------------------|-------------------|\n| mbNET/mbNET .rokey | >= 7.0.0         |\n| mbNET HW1         | >= 5.1.11         |\n","group_ids":["CSAFGID-0001"]}],"scores":[{"cvss_v3":{"attackComplexity":"HIGH","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":3.7,"baseSeverity":"LOW","confidentialityImpact":"NONE","environmentalScore":3.7,"environmentalSeverity":"LOW","integrityImpact":"LOW","privilegesRequired":"NONE","scope":"UNCHANGED","temporalScore":3.7,"temporalSeverity":"LOW","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N","version":"3.1"},"products":["CSAFPID-51001","CSAFPID-51002"]}],"title":"CVE-2020-25686"}]}