Test ID:	1.3.6.1.4.1.25623.1.1.2.2021.1551
Category:	Huawei EulerOS Local Security Checks
Title:	Huawei EulerOS: Security Advisory for dnsmasq (EulerOS-SA-2021-1551)
Summary:	The remote host is missing an update for the Huawei EulerOS 'dnsmasq' package(s) announced via the EulerOS-SA-2021-1551 advisory.
Description:	Summary: The remote host is missing an update for the Huawei EulerOS 'dnsmasq' package(s) announced via the EulerOS-SA-2021-1551 advisory. Vulnerability Insight: A flaw was found in dnsmasq. 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.(CVE-2020-25687) A flaw was found in dnsmasq. 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.(CVE-2020-25686) A flaw was found in dnsmasq. A heap-based buffer overflow was discovered in dnsmasq when DNSSEC is enabled and before it validates the received DNS entries. A remote attacker, who can create valid DNS replies, could use this flaw 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 get_rdata() and cause a crash in dnsmasq, resulting in a denial of service. The highest threat from this vulnerability is to system availability.(CVE-2020-25685) A flaw was found in dnsmasq. 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.(CVE-2020-25684) A flaw was found in dnsmasq. A heap-based buffer overflow was discovered in dnsmasq when DNSSEC is enabled and before it validates the received DNS entries. A remote attacker, who can create valid DNS replies, could use ... [Please see the references for more information on the vulnerabilities] Affected Software/OS: 'dnsmasq' package(s) on Huawei EulerOS Virtualization for ARM 64 3.0.6.0. Solution: Please install the updated package(s). CVSS Score: 8.3 CVSS Vector: AV:N/AC:M/Au:N/C:P/I:P/A:C
Cross-Ref:	Common Vulnerability Exposure (CVE) ID: CVE-2020-25681 Debian Security Information: DSA-4844 (Google Search) https://www.debian.org/security/2021/dsa-4844 https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/QGB7HL3OWHTLEPSMLDGOMXQKG3KM2QME/ https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/WYW3IR6APUSKOYKL5FT3ACTIHWHGQY32/ https://security.gentoo.org/glsa/202101-17 https://bugzilla.redhat.com/show_bug.cgi?id=1881875 https://www.jsof-tech.com/disclosures/dnspooq/ https://lists.debian.org/debian-lts-announce/2021/03/msg00027.html Common Vulnerability Exposure (CVE) ID: CVE-2020-25682 https://bugzilla.redhat.com/show_bug.cgi?id=1882014 Common Vulnerability Exposure (CVE) ID: CVE-2020-25683 https://bugzilla.redhat.com/show_bug.cgi?id=1882018 Common Vulnerability Exposure (CVE) ID: CVE-2020-25684 https://www.arista.com/en/support/advisories-notices/security-advisories/12135-security-advisory-61 https://bugzilla.redhat.com/show_bug.cgi?id=1889686 Common Vulnerability Exposure (CVE) ID: CVE-2020-25685 https://bugzilla.redhat.com/show_bug.cgi?id=1889688 Common Vulnerability Exposure (CVE) ID: CVE-2020-25686 https://bugzilla.redhat.com/show_bug.cgi?id=1890125 Common Vulnerability Exposure (CVE) ID: CVE-2020-25687 https://bugzilla.redhat.com/show_bug.cgi?id=1891568
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