Описание
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 h...
| Релиз | Статус | Примечание |
|---|---|---|
| bionic | ignored | end of standard support, was needs-triage |
| devel | released | 2.0.13-1.4ubuntu1 |
| esm-apps/bionic | released | 2.0.13-1.2ubuntu0.1~esm1 |
| esm-apps/focal | released | 2.0.13-1.4+deb11u1build0.20.04.1 |
| esm-apps/jammy | released | 2.0.13-1.4+deb11u1build0.22.04.1 |
| esm-apps/xenial | released | 2.0.13-1ubuntu0.1~esm1 |
| focal | released | 2.0.13-1.4+deb11u1build0.20.04.1 |
| jammy | released | 2.0.13-1.4+deb11u1build0.22.04.1 |
| kinetic | ignored | end of life, was needs-triage |
| lunar | released | 2.0.13-1.4+deb11u1build0.23.04.1 |
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7.5 High
CVSS3
Связанные уязвимости
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 ha
MaraDNS is open-source software that implements the Domain Name System ...
Уязвимость функции decomp_get_rddata в файле Decompress.c программного обеспечения реализации системы доменных имен MaraDNS, позволяющая нарушителю выполнить атаку типа «отказ в обслуживании»
7.5 High
CVSS3