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lo_put() surely should require UPDATE permission, the same as lowrite(), but it failed to check for that, as reported by Chapman Flack. Oversight in commit c50b7c09d; backpatch to 9.4 where that was introduced. Tom Lane and Michael Paquier Security: CVE-2017-7548
src/backend/libpq/README.SSL
SSL
===
>From the servers perspective:
Receives StartupPacket
|
|
(Is SSL_NEGOTIATE_CODE?) ----------- Normal startup
| No
|
| Yes
|
|
(Server compiled with USE_SSL?) ------- Send 'N'
| No |
| |
| Yes Normal startup
|
|
Send 'S'
|
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Establish SSL
|
|
Normal startup
>From the clients perspective (v6.6 client _with_ SSL):
Connect
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Send packet with SSL_NEGOTIATE_CODE
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Receive single char ------- 'S' -------- Establish SSL
| |
| '<else>' |
| Normal startup
|
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Is it 'E' for error ------------------- Retry connection
| Yes without SSL
| No
|
Is it 'N' for normal ------------------- Normal startup
| Yes
|
Fail with unknown
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