Vulnerability Information
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Vulnerability Title
Denial of service when trimming EDE text on positive replies
Vulnerability Description
NLnet Labs Unbound version 1.18.0 up to and including version 1.19.1 contain a vulnerability that can cause denial of service by a certain code path that can lead to an infinite loop. Unbound 1.18.0 introduced a feature that removes EDE records from responses with size higher than the client's advertised buffer size. Before removing all the EDE records however, it would try to see if trimming the extra text fields on those records would result in an acceptable size while still retaining the EDE codes. Due to an unchecked condition, the code that trims the text of the EDE records could loop indefinitely. This happens when Unbound would reply with attached EDE information on a positive reply and the client's buffer size is smaller than the needed space to include EDE records. The vulnerability can only be triggered when the 'ede: yes' option is used; non default configuration. From version 1.19.2 on, the code is fixed to avoid looping indefinitely.
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Vulnerability Type
不可达退出条件的循环(无限循环)
Vulnerability Title
NLnet Labs Unbound 安全漏洞
Vulnerability Description
NLnet Labs Unbound是荷兰NLnet Labs团队的一款开源DNS服务器。 NLnet Labs Unbound 1.18.0 至 1.19.1版本存在安全漏洞，该漏洞源于特定代码路径存在无限循环，导致拒绝服务。
CVSS Information
N/A
Vulnerability Type
N/A