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Debian Security Advisory 5441-1
Debian Linux Security Advisory 5441-1 - Two vulnerabilities were found in maradns, an open source domain name system (DNS) implementation, that may lead to denial of service and unintended domain name resolution.
-----BEGIN PGP SIGNED MESSAGE-----Hash: SHA256- -------------------------------------------------------------------------Debian Security Advisory DSA-5441-1 [email protected]://www.debian.org/security/ Aron XuJune 29, 2023 https://www.debian.org/security/faq- -------------------------------------------------------------------------Package : maradnsCVE ID : CVE-2022-30256 CVE-2023-31137Debian Bug : 1033252 1035936Brief introduction Two vulnerbilities were found in maradns, an open source domain namesystem (DNS) implementation, that may lead to denial of service andunintended domain name resolution.For the oldstable distribution (bullseye), these problems have been fixedin version 2.0.13-1.4+deb11u1.We recommend that you upgrade your maradns packages.For the detailed security status of maradns please refer toits security tracker page at:https://security-tracker.debian.org/tracker/maradnsFurther information about Debian Security Advisories, how to applythese updates to your system and frequently asked questions can befound at: https://www.debian.org/security/Mailing list: [email protected] PGP SIGNATURE-----iQEzBAEBCAAdFiEEhhz+aYQl/Bp4OTA7O1LKKgqv2VQFAmSc6j4ACgkQO1LKKgqv2VSQLgf/Tn5pYOeHQDp4pK8nzpQ4FgIZkbxmsjvuzT3SEX637sDWz2hAfbeIWxjww0KbZnkdQIkPOWh6s5jZ3W4hvU7S+nhPjGiU88PXvGAyYItvU2QfaEXWzy4wwLBlPfuh8CiVJxREyvEk9sjZCGr/VqwQyY0ttYqbkpmx0cscm7MpdWBa7WsFFh19bNXUD3tWs0RPH0V5HNOwuBiay0uFh0V2o4PAssR8qaYeDfW2QQT5i1uf2wyW+Bq7IYUsxvMUKo3iRPQ9pX/nnpj0+ZyG/Mtn6tI8F0gMt/LS6LiAyQz/D7EdBguUJ56LZ/oniquCYAyAfnDwNRat66CEEpZpMXN0Xw===eb0N-----END PGP SIGNATURE-----Related news
Ubuntu Security Notice 6271-1 - Xiang Li discovered that MaraDNS incorrectly handled certain inputs. If a user or an automated system were tricked into opening a specially crafted input file, a remote attacker could possibly use this issue to obtain sensitive information. Huascar Tejeda discovered that MaraDNS incorrectly handled certain inputs. If a user or an automated system were tricked into opening a specially crafted input file, a remote attacker could possibly use this issue to cause a denial of service.
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...
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.