libpq: Bail out during SSL/GSS negotiation errors#1633
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reshke wants to merge 1 commit intoapache:mainfrom
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libpq: Bail out during SSL/GSS negotiation errors#1633reshke wants to merge 1 commit intoapache:mainfrom
reshke wants to merge 1 commit intoapache:mainfrom
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This commit changes libpq so that errors reported by the backend during the protocol negotiation for SSL and GSS are discarded by the client, as these may include bytes that could be consumed by the client and write arbitrary bytes to a client's terminal. A failure with the SSL negotiation now leads to an error immediately reported, without a retry on any other methods allowed, like a fallback to a plaintext connection. A failure with GSS discards the error message received, and we allow a fallback as it may be possible that the error is caused by a connection attempt with a pre-11 server, GSS encryption having been introduced in v12. This was a problem only with v17 and newer versions; older versions discard the error message already in this case, assuming a failure caused by a lack of support for GSS encryption. Author: Jacob Champion Reviewed-by: Peter Eisentraut, Heikki Linnakangas, Michael Paquier Security: CVE-2024-10977 Backpatch-through: 12
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approved these changes
Mar 21, 2026
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This commit changes libpq so that errors reported by the backend during the protocol negotiation for SSL and GSS are discarded by the client, as these may include bytes that could be consumed by the client and write arbitrary bytes to a client's terminal.
A failure with the SSL negotiation now leads to an error immediately reported, without a retry on any other methods allowed, like a fallback to a plaintext connection.
A failure with GSS discards the error message received, and we allow a fallback as it may be possible that the error is caused by a connection attempt with a pre-11 server, GSS encryption having been introduced in v12. This was a problem only with v17 and newer versions; older versions discard the error message already in this case, assuming a failure caused by a lack of support for GSS encryption.
Author: Jacob Champion
Reviewed-by: Peter Eisentraut, Heikki Linnakangas, Michael Paquier
Security: CVE-2024-10977
Backpatch-through: 12
Back-ported-by: reshke reshke@double.cloud
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CBDB source commit is https://git.postgresql.org/cgit/postgresql.git/commit/?h=e6c9454764d880ee30735aa8c1e05d3674722ff9