-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA512 Format: 1.8 Date: Wed, 29 Mar 2023 10:57:23 CEST Source: unbound Architecture: source Version: 1.9.0-2+deb10u3 Distribution: buster-security Urgency: high Maintainer: unbound packagers <unbound@packages.debian.org> Changed-By: Markus Koschany <apo@debian.org> Checksums-Sha1: 261f6a353ffe9495cff0b90d656890704e9aa3c9 3209 unbound_1.9.0-2+deb10u3.dsc 7e5634216ecffd79f192f579d66916ffd4c2d2b8 35720 unbound_1.9.0-2+deb10u3.debian.tar.xz 51de90d5fd6bfef833badd9be8de1f2e668950bd 11484 unbound_1.9.0-2+deb10u3_amd64.buildinfo Checksums-Sha256: 9d7e5f6590cdb52cda3d1f11c2a243ee4033370651dfe1dbca5716e217ca4bf6 3209 unbound_1.9.0-2+deb10u3.dsc b8d43f47f38cc6cd891f99b170d0a372df695400a7eaa5b8702477c8f0682f0f 35720 unbound_1.9.0-2+deb10u3.debian.tar.xz 68af9d45874b5b7c7a962b87a13996a0005e5cc44140e23dba732dbc9dd5b00e 11484 unbound_1.9.0-2+deb10u3_amd64.buildinfo Changes: unbound (1.9.0-2+deb10u3) buster-security; urgency=high . * Non-maintainer upload by the LTS team. * Fix CVE-2022-3204: A vulnerability named 'Non-Responsive Delegation Attack' (NRDelegation Attack) has been discovered in various DNS resolving software. The NRDelegation Attack works by having a malicious delegation with a considerable number of non responsive nameservers. The attack starts by querying a resolver for a record that relies on those unresponsive nameservers. The attack can cause a resolver to spend a lot of time/resources resolving records under a malicious delegation point where a considerable number of unresponsive NS records reside. It can trigger high CPU usage in some resolver implementations that continually look in the cache for resolved NS records in that delegation. This can lead to degraded performance and eventually denial of service in orchestrated attacks. Unbound does not suffer from high CPU usage, but resources are still needed for resolving the malicious delegation. Unbound will keep trying to resolve the record until hard limits are reached. Based on the nature of the attack and the replies, different limits could be reached. From now on Unbound introduces fixes for better performance when under load, by cutting opportunistic queries for nameserver discovery and DNSKEY prefetching and limiting the number of times a delegation point can issue a cache lookup for missing records. * Fix CVE-2022-30698 and CVE-2022-30699: NLnet Labs Unbound is vulnerable to a novel type of the "ghost domain names" attack. The vulnerability works by targeting an Unbound instance. Unbound is queried for a rogue domain name when the cached delegation information is about to expire. The rogue nameserver delays the response so that the cached delegation information is expired. Upon receiving the delayed answer containing the delegation information, Unbound overwrites the now expired entries. This action can be repeated when the delegation information is about to expire making the rogue delegation information ever-updating. From now on Unbound stores the start time for a query and uses that to decide if the cached delegation information can be overwritten. * Fix CVE-2020-28935: Unbound contains a local vulnerability that would allow for a local symlink attack. When writing the PID file Unbound creates the file if it is not there, or opens an existing file for writing. In case the file was already present, it would follow symlinks if the file happened to be a symlink instead of a regular file. Files: 5e20d9806a2ce9be4e41ee8f4fc09ac3 3209 net optional unbound_1.9.0-2+deb10u3.dsc 1780a70d9b191ac2af60e1bd31783c18 35720 net optional unbound_1.9.0-2+deb10u3.debian.tar.xz dce5c64d60a113416f15bd5c84fa6b68 11484 net optional unbound_1.9.0-2+deb10u3_amd64.buildinfo -----BEGIN PGP SIGNATURE----- iQKjBAEBCgCNFiEErPPQiO8y7e9qGoNf2a0UuVE7UeQFAmQj/XlfFIAAAAAALgAo aXNzdWVyLWZwckBub3RhdGlvbnMub3BlbnBncC5maWZ0aGhvcnNlbWFuLm5ldEFD RjNEMDg4RUYzMkVERUY2QTFBODM1RkQ5QUQxNEI5NTEzQjUxRTQPHGFwb0BkZWJp YW4ub3JnAAoJENmtFLlRO1Hkh6AP/0NscQVe3vJJlPrrDK4DDbf16kG+ftpVPB55 hFOLWyINFToMU+Pi1Up+C/KjX48Au8cAlpeYBX9Lm2tFplC5GA33uO2GFhar3fNX aOvox0lvMmM8twrd+XL5BkutezEFjfXxqP0sIUAdGztkkPYR2wiCHqzyeFoeKhu1 oXx+wd7GdwZ+aOs6lIHpM8CQDWddP5HYtewKTKjh8erl2LAE3mdHeGVeenmdIh8a YN58Y4oNlD1w3QRcEcqYslOk85rdIPqKzhziS9YiOQmbyHL0k4ILvaipaFS329wL Q5joej2YCIVwmRgKYzkk/xxUm7lvuvAvyHM+i4skLERHPVY9iA2CG/1qn0JWEpJN 2gt3zLXtgjKuJpSbqiyj2snhrvMgw+iRiKrcWjC82hb1FhBcbiaDcTr+gVOpksc6 T6BAzl9/rPa6Tpjv318qJs1NyB9/mXtQ+Y/O7MOn8y8QTIaHyklQMjtic1/3vkqt kDfx3yqY6ycOmbWAhkvYaqccL/wISml3oEGWZ2Z9cpEw6oKNXwoU0s9wkQ/6/E6+ IGj+rRyFdqOpHVjF1JVSc0vTBAudSvE1dplfRFh38qRz5ptOtI8d6JreuFiYulo1 ZRTzNkTcd5751nbbI4QbWSgq0Uow46Iu3aF+V7XxXIlfmmAA3J7tcYDPgA1r4MGe vLN6o5TH =wGPO -----END PGP SIGNATURE-----
