Vulnerability Information
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Vulnerability Title
MaraDNS Integer Underflow Vulnerability in DNS Packet Decompression
Vulnerability Description
MaraDNS is open-source software that implements the Domain Name System (DNS). In version 3.5.0024 and prior, a remotely exploitable integer underflow vulnerability in the DNS packet decompression function allows an attacker to cause a Denial of Service by triggering an abnormal program termination. The vulnerability exists in the `decomp_get_rddata` function within the `Decompress.c` file. When handling a DNS packet with an Answer RR of qtype 16 (TXT record) and any qclass, if the `rdlength` is smaller than `rdata`, the result of the line `Decompress.c:886` is a negative number `len = rdlength - total;`. This value is then passed to the `decomp_append_bytes` function without proper validation, causing the program to attempt to allocate a massive chunk of memory that is impossible to allocate. Consequently, the program exits with an error code of 64, causing a Denial of Service. One proposed fix for this vulnerability is to patch `Decompress.c:887` by breaking `if(len <= 0)`, which has been incorporated in version 3.5.0036 via commit bab062bde40b2ae8a91eecd522e84d8b993bab58.
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Vulnerability Type
整数下溢(超界折返)
Vulnerability Title
MaraDNS 数字错误漏洞
Vulnerability Description
MaraDNS是Sam Trenholme个人开发者的一种开源域名系统实现，可以用作缓存，递归或权威名称服务器。 MaraDNS 3.5.0024及之前版本存在数字错误漏洞，该漏洞源于DNS 数据包解压缩功能中存在可远程利用的整数下溢，允许攻击者通过触发异常来导致拒绝服务。
CVSS Information
N/A
Vulnerability Type
N/A