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CVE-2022-3204— NLnet Labs Unbound 资源管理错误漏洞

一分钟漏洞结论

影响对象
NLnet Labs Unbound
利用判断
尚无明确在野利用证据，仍需结合暴露面评估
建议动作
优先检查厂商安全公告和参考链接中的修复版本；无法立即升级时，限制受影响服务暴露并加强监测。

NLnet Labs Unbound是NLnet Labs公司的一款开源DNS服务器。 NLnet Labs Unbound 1.16.3 之前版本存在安全漏洞，该漏洞源于Unbound不会受到高CPU使用率的影响，但仍需要资源来解决恶意委托，会不断尝试解析记录，直到达到硬限制。根据攻击和回复的性质，可能会达到不同的限制。

AI 预测 7.5 利用难度: 中等 EPSS 1.64% · P76
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一、 漏洞 CVE-2022-3204 基础信息

漏洞信息
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Vulnerability Title
NRDelegation Attack
来源: CVE Program / CVE List V5
Vulnerability Description
A vulnerability named 'Non-Responsive Delegation Attack' (NRDelegation Attack) has been discovered in various DNS resolving software. The NRDelegation Attack works by having a malicious delegation with a considerable number of non responsive nameservers. The attack starts by querying a resolver for a record that relies on those unresponsive nameservers. The attack can cause a resolver to spend a lot of time/resources resolving records under a malicious delegation point where a considerable number of unresponsive NS records reside. It can trigger high CPU usage in some resolver implementations that continually look in the cache for resolved NS records in that delegation. This can lead to degraded performance and eventually denial of service in orchestrated attacks. Unbound does not suffer from high CPU usage, but resources are still needed for resolving the malicious delegation. Unbound will keep trying to resolve the record until hard limits are reached. Based on the nature of the attack and the replies, different limits could be reached. From version 1.16.3 on, Unbound introduces fixes for better performance when under load, by cutting opportunistic queries for nameserver discovery and DNSKEY prefetching and limiting the number of times a delegation point can issue a cache lookup for missing records.
来源: CVE Program / CVE List V5
CVSS Information
N/A
来源: CVE Program / CVE List V5
Vulnerability Type
N/A
来源: CVE Program / CVE List V5
Vulnerability Title
NLnet Labs Unbound 资源管理错误漏洞
来源: 中国国家信息安全漏洞库 CNNVD
Vulnerability Description
NLnet Labs Unbound是NLnet Labs公司的一款开源DNS服务器。 NLnet Labs Unbound 1.16.3 之前版本存在安全漏洞，该漏洞源于Unbound不会受到高CPU使用率的影响，但仍需要资源来解决恶意委托，会不断尝试解析记录，直到达到硬限制。根据攻击和回复的性质，可能会达到不同的限制。
来源: 中国国家信息安全漏洞库 CNNVD
CVSS Information
N/A
来源: 中国国家信息安全漏洞库 CNNVD
Vulnerability Type
N/A
来源: 中国国家信息安全漏洞库 CNNVD

受影响产品

厂商 产品 影响版本 CPE 订阅
NLnet Labs Unbound unspecified ~ 1.16.2 -

二、漏洞 CVE-2022-3204 的公开POC

# POC 描述 源链接 神龙链接
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三、漏洞 CVE-2022-3204 的情报信息

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CVE-2022-3204 厂商安全公告 (1)

CVE-2022-3204 邮件列表归档 (4)

CVE-2022-3204 其他参考 (1)

IV. Related Vulnerabilities

Same product: Unbound
Same vendor: NLnet Labs

V. Comments for CVE-2022-3204

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