Date: Tue, 30 Jul 2019 13:37:15 +0200 From: Peter van Dijk <peter.van.dijk@...erdns.com> To: oss-security@...ts.openwall.com Subject: PowerDNS Security Advisory 2019-06: Denial of service via crafted zone records Hello, please find below the text of PowerDNS Security Advisory 2019-06. Updated packages (that only contain a Postgres schema change) will be released later. Just upgrading at that time will not fix the vulnerability - applying the schema change is mandatory. > PowerDNS Security Advisory 2019-06: Denial of service via crafted zone records > ============================================================================== > > - CVE: CVE-2019-10203 > - Date: July 30th, 2019 > - Affects: PowerDNS Authoritative 4.0.0 and up, when using the gpgsql (PostgreSQL) backend > - Not affected: 4.2.0, 4.1.11, 4.0.9 > - Severity: Low > - Impact: Denial of Service > - Exploit: This problem can be triggered via crafted records > - Risk of system compromise: No > - Solution: Update the database schema > - Workaround: run the process inside the guardian or inside a supervisor > > An issue has been found in PowerDNS Authoritative Server allowing an > authorized user to cause the server to exit by inserting a crafted record in a > MASTER type zone under their control. The issue is due to the fact that the > Authoritative Server will exit when it tries to store the notified serial in > the PostgreSQL database, if this serial cannot be represented in 31 bits. > > This issue has been assigned CVE-2019-10203. > > PowerDNS Authoritative up to and including 4.1.10 is affected. Please note > that at the time of writing, PowerDNS Authoritative 3.4 and below are no > longer supported, as described in > https://doc.powerdns.com/authoritative/appendices/EOL.html. > > To fix the issue, run the following command against your PostgreSQL pdns > database: `ALTER TABLE domains ALTER notified_serial TYPE bigint USING CASE > WHEN notified_serial >= 0 THEN notified_serial::bigint END;`. No software > changes are required. > > We would like to thank Klaus Darilion for finding and subsequently reporting > this issue! Kind regards, -- Peter van Dijk PowerDNS.COM BV - https://www.powerdns.com/ Download attachment "signature.asc" of type "application/pgp-signature" (915 bytes)
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