From: ZhangChi <798604270@qq.com>
To: Laurenz Albe <laurenz.albe@cybertec.at>
To: pgsql-bugs <pgsql-bugs@lists.postgresql.org>
Subject: Re: BUG #18936: Trigger enable users to modify the tables which hedoesn't have privilege
Date: Sat, 24 May 2025 11:06:24 +0800
Message-ID: <tencent_6FB22713DA38A8D08B25F3DDD06B9C792B07@qq.com> (raw)
In-Reply-To: <c842110a59d8c273c2edecc3510e2c3a4bca3d3c.camel@cybertec.at>
References: <18936-197af1cbbd49156f@postgresql.org>
<c842110a59d8c273c2edecc3510e2c3a4bca3d3c.camel@cybertec.at>
Thanks for your reply!
However, it is common in some database servers for an attacker to gain minimal privileges on a single table within a target database. For instance, when registering an account on a service, the system might grant the user access to a dedicated table. Using the TRIGGER mechanism as I showed, such an attacker could then delete or exfiltrate data from other tables beyond their authorized access. Notably, this attack doesn't require superuser privileges - only access to the two relevant tables.
Permitting users to create triggers that can affect tables beyond their privilege scope appears to be a problematic design choice. Such triggers may be inadvertently executed by privileged users without their knowledge, creating potential security vulnerabilities.
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To: pgsql-bugs@postgresql.org
Cc: 798604270@qq.com, laurenz.albe@cybertec.at, pgsql-bugs@lists.postgresql.org
Subject: Re: BUG #18936: Trigger enable users to modify the tables which hedoesn't have privilege
In-Reply-To: <tencent_6FB22713DA38A8D08B25F3DDD06B9C792B07@qq.com>
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