CVSS 7.5 · High EPSS 1,1%
Kerentanan Integer Underflow (Wrap or Wraparound) pada maradns, fedoraproject fedora +1 lainnya. Skor CVSS 3.1 7.5 (High) menurut NVD.
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:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
· uraikan di kalkulator | Vendor | Produk | Versi terdampak |
|---|---|---|
| maradns | maradns | Semua versi sebelum 3.4.10 |
| maradns | maradns | Versi 3.5.0001 hingga sebelum 3.5.0036 |
| fedoraproject | fedora | Versi 37 |
| fedoraproject | fedora | Versi 38 |
| debian | debian linux | Versi 10.0 |
| debian | debian linux | Versi 11.0 |