CVE-2024-8508
unbound - security update
描述
NLnet Labs Unbound up to and including version 1.21.0 contains a vulnerability when handling replies with very large RRsets that it needs to perform name compression for. Malicious upstreams responses with very large RRsets can cause Unbound to spend a considerable time applying name compression to downstream replies. This can lead to degraded performance and eventually denial of service in well orchestrated attacks. The vulnerability can be exploited by a malicious actor querying Unbound for the specially crafted contents of a malicious zone with very large RRsets. Before Unbound replies to the query it will try to apply name compression which was an unbounded operation that could lock the CPU until the whole packet was complete. Unbound version 1.21.1 introduces a hard limit on the number of name compression calculations it is willing to do per packet. Packets that need more compression will result in semi-compressed packets or truncated packets, even on TCP for huge messages, to avoid locking the CPU for long. This change should not affect normal DNS traffic.
如何修補 CVE-2024-8508
要修補 CVE-2024-8508,請將受影響套件升級到下列已修補版本。
- —升級至 1.20.0-r1 或更新版本
- —升級至 1.13.1-1+deb11u4 或更新版本
- —升級至 1.13.1-1+deb11u4 或更新版本
- —升級至 0.26.1 或更新版本
CVE-2024-8508 正在被利用嗎?
低 — EPSS 為 0.8%,目前沒有觀察到大規模利用活動。
受影響套件(4)
- from 0, < 1.20.0-r1
- from 0, < 1.13.1-1+deb11u4
- from 0, < 1.13.1-1+deb11u4
- >= 0.3.1, < 0.26.1
CVSS 分數
| 來源 | 版本 | 嚴重程度 | 向量 |
|---|---|---|---|
| osv | CVSS 3.1 | MEDIUM5.3 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L |