Описание
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.
| Релиз | Статус | Примечание |
|---|---|---|
| bionic | released | 2.79-1ubuntu0.2 |
| devel | released | 2.82-1ubuntu2 |
| esm-infra-legacy/trusty | not-affected | code not present |
| esm-infra/bionic | released | 2.79-1ubuntu0.2 |
| esm-infra/focal | released | 2.80-1.1ubuntu1.2 |
| esm-infra/xenial | released | 2.75-1ubuntu0.16.04.7 |
| focal | released | 2.80-1.1ubuntu1.2 |
| groovy | released | 2.82-1ubuntu1.1 |
| hirsute | released | 2.82-1ubuntu2 |
| impish | released | 2.82-1ubuntu2 |
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EPSS
7.1 High
CVSS2
5.9 Medium
CVSS3
Связанные уязвимости
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.
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.
A flaw was found in dnsmasq before version 2.83. A heap-based buffer o ...
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.
EPSS
7.1 High
CVSS2
5.9 Medium
CVSS3