CVSS: 7.1EPSS: 9%CPEs: 5EXPL: 0CVE-2020-25687 – dnsmasq: heap-based buffer overflow with large memcpy in sort_rrset() when DNSSEC is enabled
https://notcve.org/view.php?id=CVE-2020-25687
A flaw was found in dnsmasq before version 2.83. A heap-based buffer overflow was discovered in dnsmasq when DNSSEC is enabled and before it validates the received DNS entries. This flaw allows a remote attacker, who can create valid DNS replies, to cause an overflow in a heap-allocated memory. This flaw is caused by the lack of length checks in rfc1035.c:extract_name(), which could be abused to make the code execute memcpy() with a negative size in sort_rrset() and cause a crash in dnsmasq, resulting in a denial of service. The highest threat from this vulnerability is to system availability. • https://bugzilla.redhat.com/show_bug.cgi?id=1891568 https://lists.debian.org/debian-lts-announce/2021/03/msg00027.html https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/QGB7HL3OWHTLEPSMLDGOMXQKG3KM2QME https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WYW3IR6APUSKOYKL5FT3ACTIHWHGQY32 https://security.gentoo.org/glsa/202101-17 https://www.debian.org/security/2021/dsa-4844 https://www.jsof-tech.com/disclosures/dnspooq https:// • CWE-122: Heap-based Buffer Overflow •
CVSS: 4.3EPSS: 1%CPEs: 10EXPL: 0CVE-2020-25684 – dnsmasq: loose address/port check in reply_query() makes forging replies easier for an off-path attacker
https://notcve.org/view.php?id=CVE-2020-25684
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. • https://bugzilla.redhat.com/show_bug.cgi?id=1889686 https://lists.debian.org/debian-lts-announce/2021/03/msg00027.html https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/QGB7HL3OWHTLEPSMLDGOMXQKG3KM2QME https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WYW3IR6APUSKOYKL5FT3ACTIHWHGQY32 https://security.gentoo.org/glsa/202101-17 https://www.arista.com/en/support/advisories-notices/security-advisories/12135-security-advisory-61 https://www • CWE-358: Improperly Implemented Security Check for Standard •
CVSS: 4.3EPSS: 0%CPEs: 9EXPL: 0CVE-2020-25685 – dnsmasq: loose query name check in reply_query() makes forging replies easier for an off-path attacker
https://notcve.org/view.php?id=CVE-2020-25685
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. • https://bugzilla.redhat.com/show_bug.cgi?id=1889688 https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/QGB7HL3OWHTLEPSMLDGOMXQKG3KM2QME https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WYW3IR6APUSKOYKL5FT3ACTIHWHGQY32 https://security.gentoo.org/glsa/202101-17 https://www.arista.com/en/support/advisories-notices/security-advisories/12135-security-advisory-61 https://www.debian.org/security/2021/dsa-4844 https://www.jsof-tech.com/discl • CWE-326: Inadequate Encryption Strength •
CVSS: 4.3EPSS: 0%CPEs: 9EXPL: 0CVE-2020-25686 – dnsmasq: multiple queries forwarded for the same name makes forging replies easier for an off-path attacker
https://notcve.org/view.php?id=CVE-2020-25686
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. • https://bugzilla.redhat.com/show_bug.cgi?id=1890125 https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/QGB7HL3OWHTLEPSMLDGOMXQKG3KM2QME https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WYW3IR6APUSKOYKL5FT3ACTIHWHGQY32 https://security.gentoo.org/glsa/202101-17 https://www.arista.com/en/support/advisories-notices/security-advisories/12135-security-advisory-61 https://www.debian.org/security/2021/dsa-4844 https://www.jsof-tech.com/discl • CWE-290: Authentication Bypass by Spoofing CWE-358: Improperly Implemented Security Check for Standard •
CVSS: 6.5EPSS: 1%CPEs: 5EXPL: 0CVE-2021-3181 – mutt: Memory leak when parsing rfc822 group addresses
https://notcve.org/view.php?id=CVE-2021-3181
rfc822.c in Mutt through 2.0.4 allows remote attackers to cause a denial of service (mailbox unavailability) by sending email messages with sequences of semicolon characters in RFC822 address fields (aka terminators of empty groups). A small email message from the attacker can cause large memory consumption, and the victim may then be unable to see email messages from other persons. El archivo rfc822.c en Mutt versiones hasta 2.0.4, permite a atacantes remotos causar una denegación de servicio (buzón de correo no disponible) mediante el envío de mensajes de correo electrónico con secuencias de caracteres de punto y coma en los campos de dirección RFC822 (también se conoce como terminadores de grupos vacíos). Un pequeño mensaje de correo electrónico del atacante puede causar un gran consumo de memoria y, por lo tanto, es posible que la víctima no pueda ver los mensajes de correo electrónico de otras personas • http://www.openwall.com/lists/oss-security/2021/01/19/10 http://www.openwall.com/lists/oss-security/2021/01/27/3 https://gitlab.com/muttmua/mutt/-/commit/4a2becbdb4422aaffe3ce314991b9d670b7adf17 https://gitlab.com/muttmua/mutt/-/commit/939b02b33ae29bc0d642570c1dcfd4b339037d19 https://gitlab.com/muttmua/mutt/-/commit/d4305208955c5cdd9fe96dfa61e7c1e14e176a14 https://gitlab.com/muttmua/mutt/-/issues/323 https://lists.debian.org/debian-lts-announce/2021/01/msg00017.html https://lists.fedoraproject&# • CWE-401: Missing Release of Memory after Effective Lifetime •