CVSS: 7.5EPSS: 0%CPEs: 6EXPL: 0CVE-2023-31137 – MaraDNS Integer Underflow Vulnerability in DNS Packet Decompression
https://notcve.org/view.php?id=CVE-2023-31137
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. • https://github.com/samboy/MaraDNS/blob/08b21ea20d80cedcb74aa8f14979ec7c61846663/dns/Decompress.c#L886 https://github.com/samboy/MaraDNS/commit/bab062bde40b2ae8a91eecd522e84d8b993bab58 https://github.com/samboy/MaraDNS/security/advisories/GHSA-58m7-826v-9c3c https://lists.debian.org/debian-lts-announce/2023/06/msg00019.html https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/3VSMLJX25MXGQ6A7UPOGK7VPUVDESPHL https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/NB7 • CWE-191: Integer Underflow (Wrap or Wraparound) •
CVSS: 7.5EPSS: 0%CPEs: 2EXPL: 0CVE-2022-30256
https://notcve.org/view.php?id=CVE-2022-30256
An issue was discovered in MaraDNS Deadwood through 3.5.0021 that allows variant V1 of unintended domain name resolution. A revoked domain name can still be resolvable for a long time, including expired domains and taken-down malicious domains. The effects of an exploit would be widespread and highly impactful, because the exploitation conforms to de facto DNS specifications and operational practices, and overcomes current mitigation patches for "Ghost" domain names. Se descubrió un problema en MaraDNS Deadwood hasta 3.5.0021 que permite la variante V1 de resolución de nombres de dominio no deseada. Un nombre de dominio revocado aún se puede resolver durante mucho tiempo, incluidos dominios caducados y dominios maliciosos eliminados. • https://lists.debian.org/debian-lts-announce/2023/06/msg00019.html https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/3VSMLJX25MXGQ6A7UPOGK7VPUVDESPHL https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/NB7LDZM5AGWC5BHHQHW6CP5OFNBBKFOQ https://maradns.samiam.org https://maradns.samiam.org/security.html#CVE-2022-30256 https://www.debian.org/security/2023/dsa-5441 • CWE-672: Operation on a Resource after Expiration or Release •