CVSS3
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
AI Score
Confidence
High
EPSS
Percentile
17.1%
The WriteBind()
method in src/Npgsql/Internal/NpgsqlConnector.FrontendMessages.cs
uses int
variables to store the message length and the sum of parameter lengths. Both variables overflow when the sum of parameter lengths becomes too large.
This causes Npgsql to write a message size that is too small when constructing a Postgres protocol message to send it over the network to the database. When parsing the message, the database will only read a small number of bytes and treat any following bytes as new messages while they belong to the old message.
Attackers can abuse this to inject arbitrary Postgres protocol messages into the connection, leading to the execution of arbitrary SQL statements on the application’s behalf.
Attackers can issue arbitrary SQL statements to the database on behalf of the application. The final impact depends on the application that uses Npgsql, the data it stores in Postgres, etc.
github.com/advisories/GHSA-x9vc-6hfv-hg8c
github.com/npgsql/npgsql/commit/f7e7ead0702d776a8f551f5786c4cac2d65c4bc6
github.com/npgsql/npgsql/files/14309386/Npgsql.Security.Advisory.pdf
github.com/npgsql/npgsql/files/14309397/npgsql-protocol-overflow-poc.zip
github.com/npgsql/npgsql/releases/tag/v4.0.14
github.com/npgsql/npgsql/releases/tag/v4.1.13
github.com/npgsql/npgsql/releases/tag/v5.0.18
github.com/npgsql/npgsql/releases/tag/v6.0.11
github.com/npgsql/npgsql/releases/tag/v7.0.7
github.com/npgsql/npgsql/releases/tag/v8.0.3
github.com/npgsql/npgsql/security/advisories/GHSA-x9vc-6hfv-hg8c
CVSS3
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
AI Score
Confidence
High
EPSS
Percentile
17.1%