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help / color / mirror / Atom feedFrom: Noah Misch <[email protected]>
To: [email protected]
Subject: pgsql: Fix unbounded recursive handling of SSL/GSS in ProcessStartupPac
Date: Mon, 11 May 2026 12:19:40 +0000
Message-ID: <[email protected]> (raw)
Fix unbounded recursive handling of SSL/GSS in ProcessStartupPacket()
The handling of SSL and GSS negotiation messages in
ProcessStartupPacket() could cause a recursion of the backend,
ultimately crashing the server as the negotiation attempts were not
tracked across multiple calls processing startup packets.
A malicious client could therefore alternate rejected SSL and GSS
requests indefinitely, each adding a stack frame, until the backend
crashed with a stack overflow, taking down a server.
This commit addresses this issue by modifying ProcessStartupPacket() so
as processed negotiation attempts are tracked, preventing infinite
recursive attempts. A TAP test is added to check this problem, where
multiple SSL and GSS negotiated attempts are stacked.
Reported-by: Calif.io in collaboration with Claude and Anthropic
Research
Author: Michael Paquier <[email protected]>
Reviewed-by: Daniel Gustafsson <[email protected]>
Security: CVE-2026-6479
Backpatch-through: 14
Branch
------
REL_15_STABLE
Details
-------
https://git.postgresql.org/pg/commitdiff/3fb66d3022f7bf89143f1452e030d86bd0e1f58e
Author: Michael Paquier <[email protected]>
Modified Files
--------------
src/backend/postmaster/postmaster.c | 23 +++++++++-
src/test/Makefile | 2 +-
src/test/postmaster/.gitignore | 2 +
src/test/postmaster/Makefile | 23 ++++++++++
src/test/postmaster/README | 27 ++++++++++++
src/test/postmaster/t/004_negotiate.pl | 81 ++++++++++++++++++++++++++++++++++
6 files changed, 155 insertions(+), 3 deletions(-)
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Subject: Re: pgsql: Fix unbounded recursive handling of SSL/GSS in ProcessStartupPac
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