Date: Thu, 29 Apr 2021 04:34:11 -0600 (MDT) From: Ariadne Conill <ariadne@...eferenced.org> To: oss-security@...ts.openwall.com cc: "security-officer@....org" <security-officer@....org> Subject: Re: ISC discloses three BIND vulnerabilities (CVE-2021-25214, CVE-2021-25215, and CVE-2021-25216) Hello, On Wed, 28 Apr 2021, Michael McNally wrote: > On April 28, 2021, we (Internet Systems Consortium) disclosed three > vulnerabilities affecting our BIND 9 software: > > CVE-2021-25214: A broken inbound incremental zone update (IXFR) > can cause named to terminate unexpectedly > https://kb.isc.org/docs/cve-2021-25214 > > CVE-2021-25215: An assertion check can fail while answering queries for > DNAME records that require the DNAME to be processed to resolve itself > https://kb.isc.org/docs/cve-2021-25215 > > CVE-2021-25216: A second vulnerability in BIND's GSSAPI security policy > negotiation can be targeted by a buffer overflow attack > https://kb.isc.org/docs/cve-2021-25216 > > New versions of BIND are available from https://www.isc.org/downloads > > Operators and package maintainers who prefer to apply patches selectively can > find individual vulnerability-specific patches in the "patches" subdirectory > of the release directories for our two stable release branches (9.11 and > 9.16) > > https://downloads.isc.org/isc/bind9/9.11.31/patches > https://downloads.isc.org/isc/bind9/9.16.15/patches These directories only have patches for CVE-2021-25214 and CVE-2021-25215. A patch for CVE-2021-25216 appears to be missing. In some supported branches of Alpine, we erroneously followed a development branch of BIND, so I am trying to determine if there is anything I need to backport to cover CVE-2021-25216. Thanks in advance for any advice you can provide on this. Ariadne
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