CVE-2020-25682
描述
A flaw was found in dnsmasq before 2.83. A buffer overflow vulnerability was discovered in the way dnsmasq extract names from DNS packets before validating them with DNSSEC data. An attacker on the network, who can create valid DNS replies, could use this flaw to cause an overflow with arbitrary data in a heap-allocated memory, possibly executing code on the machine. The flaw is in the rfc1035.c:extract_name() function, which writes data to the memory pointed by name assuming MAXDNAME*2 bytes are available in the buffer. However, in some code execution paths, it is possible extract_name() gets passed an offset from the base buffer, thus reducing, in practice, the number of available bytes that can be written in the buffer. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.
如何修補 CVE-2020-25682
要修補 CVE-2020-25682,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-2020-25682 正在被利用嗎?
可能 — EPSS 為 70.8%,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 | HIGH8.1 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H |