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By spoofing the target resolver with responses that have a malformed ECDSA signature, an attacker can trigger a small memory leak. It is possible to gradually erode available memory to the point where named crashes for lack of resources.

CVE-2022-38177 is a high-severity vulnerability affecting multiple versions of ISC's BIND9 DNS server software, specifically versions 9.8.4 through 9.16.32 in the Open Source Branches, and certain Supported Preview Branches (9.9.4-S1 through 9.11.37-S1, and 9.16.8-S1 through 9.16.32-S1). The vulnerability arises from a memory leak in the DNSSEC verification code that handles ECDSA signatures. When the DNS resolver processes a response containing a malformed ECDSA signature with a length mismatch, the verification code leaks memory. An attacker can exploit this by spoofing DNS responses to the target resolver with such malformed signatures, causing the resolver's memory usage to gradually increase. Over time, this memory exhaustion can lead to the named daemon crashing due to lack of resources, resulting in denial of service (DoS). The vulnerability is classified under CWE-401 (Improper Release of Memory Before Removing Last Reference) and has a CVSS v3.1 base score of 7.5, indicating high severity. The attack vector is network-based (AV:N), requires no privileges (PR:N), no user interaction (UI:N), and impacts availability only (A:H) without affecting confidentiality or integrity. No known exploits have been reported in the wild as of the published date. The lack of patch links suggests that users should consult ISC's official advisories for updates or mitigations. This vulnerability specifically targets the DNSSEC ECDSA signature verification implementation, a critical component for DNS security validation in BIND9, widely used in internet infrastructure.

Detailed information about CVE-2022-38177: In BIND 9.8.4 -> 9.16.32 and versions 9.9.4-S1 -> 9.11.37-S1, 9.16.8-S1 -> 9.16.32-S1 of the BIND Supported Preview E

CVE-2022-38177: In BIND 9.8.4 -> 9.16.32 and versions 9.9.4-S1 -> 9.11.37-S1, 9.16.8-S1 -> 9.16.32-S1 of the BIND Supported Preview Edition, the DNSSEC verification code for the ECDSA algorithm leaks memory when there is a signature length mismatch. in ISC BIND9 - Live Threat Intelligence - Threat Radar | OffSeq.com

CVE-2022-38177: In BIND 9.8.4 -> 9.16.32 and versions 9.9.4-S1 -> 9.11.37-S1, 9.16.8-S1 -> 9.16.32-S1 of the BIND Supported Preview Edition, the DNSSEC verification code for the ECDSA algorithm leaks memory when there is a signature length mismatch. in ISC BIND9

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