Date: Thu, 28 Mar 2019 13:42:13 +0200 From: Aki Tuomi <aki.tuomi@...ecot.fi> To: oss-security@...ts.openwall.com Subject: CVE-2019-7524: Buffer overflow when reading extension header from dovecot index files Dear subscribers, we're sharing our latest advisory with you and would like to thank everyone who contributed in finding and solving those vulnerabilities. Feel free to join our bug bounty programs (open-xchange, dovecot, powerdns) at HackerOne. Please find patches for v2.2.36 and v2.3.5 attached, or download new version. Yours sincerely, Aki Tuomi Open-Xchange Oy Product: Dovecot Vendor: OX Software GmbH Internal reference: DOV-2964 (Bug ID) Vulnerability type: CWE-120 Vulnerable version: 2.0.14 - 2.3.5 Vulnerable component: fts, pop3-uidl-plugin Report confidence: Confirmed Researcher credits: Found in internal testing Solution status: Fixed by Vendor Fixed version: 126.96.36.199, 188.8.131.52 Vendor notification: 2019-02-05 Solution date: 2019-03-21 Public disclosure: 2019-03-28 CVE reference: CVE-2019-7524 CVSS: 3.0/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H/E:P/RL:O/RC:C (8.8) Vulnerability Details: When reading FTS or POP3-UIDL header from dovecot index, the input buffer size is not bound, and data is copied to target structure causing stack overflow. Risk: This can be used for local root privilege escalation or executing arbitrary code in dovecot process context. This requires ability to directly modify dovecot indexes. Steps to reproduce: Produce dovecot.index.log entry that creates an FTS header which has more than 12 bytes of data. Trigger dovecot indexer-worker or run doveadm index. Dovecot will crash. Mitigations: Since 2.3.0 dovecot has been compiled with stack smash protection, ASLR, read-only GOT tables and other techniques that make exploiting this bug much harder. Solution: Operators should update to the latest Patch Release. The only workaround is to disable FTS and pop3-uidl plugin. Please find attached patches for 2.2.36 and 2.3.5. Download attachment "dovecot-2.3.5-cve-2019-7524.tgz" of type "application/x-compressed-tar" (988 bytes) Download attachment "dovecot-2.2.36-cve-2019-7524.tgz" of type "application/x-compressed-tar" (989 bytes) Download attachment "signature.asc" of type "application/pgp-signature" (489 bytes)
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