CVE-2020-25687

描述

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.

如何修補 CVE-2020-25687

要修補 CVE-2020-25687,請將受影響套件升級到下列已修補版本。

—升級至 2.83-r0 或更新版本
—升級至 2.83-1 或更新版本

CVE-2020-25687 正在被利用嗎?

可能 — EPSS 為 86.7%,屬於高被利用機率區間,建議優先修補。

受影響套件(2)

from 0, < 2.83-r0
from 0, < 2.83-1

CVSS 分數

來源	版本	嚴重程度	向量
osv	CVSS 3.1	MEDIUM5.9	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H