Описание
Use of inherently dangerous function PQfn(..., result_is_int=0, ...) in PostgreSQL libpq lo_export(), lo_read(), lo_lseek64(), and lo_tell64() functions allows the server superuser to overwrite a client stack buffer with an arbitrarily-large response. Like gets(), PQfn(..., result_is_int=0, ...) stores arbitrary-length, server-determined data into a buffer of unspecified size. Because both the \lo_export command in psql and pg_dump call lo_read(), the server superuser can overwrite pg_dump or psql stack memory. Versions before PostgreSQL 18.4, 17.10, 16.14, 15.18, and 14.23 are affected.
A flaw was found in PostgreSQL libpq. A server superuser can exploit a buffer overflow vulnerability in the PQfn function, which is used by client functions such as lo_export(), lo_read(), lo_lseek64(), and lo_tell64(). This allows the superuser to send an arbitrarily large response, overwriting the client's stack memory, specifically in tools like psql and pg_dump. This could lead to arbitrary code execution on the client system.
Отчет
This IMPORTANT buffer overflow in PostgreSQL libpq allows a malicious server superuser to overwrite client stack memory via lo_* functions. Exploitation requires the victim to connect to a compromised or malicious server (UI:R). The scope is changed as the server attack affects the client system. Impact is high to confidentiality, integrity, and availability through potential client-side code execution. Affects versions before 18.4, 17.10, 16.14, 15.18, and 14.23.
Меры по смягчению последствий
Only connect to trusted PostgreSQL servers. Avoid using psql or pg_dump against untrusted or potentially compromised database servers.
Затронутые пакеты
| Платформа | Пакет | Состояние | Рекомендация | Релиз |
|---|---|---|---|---|
| Red Hat Enterprise Linux 6 | postgresql | Out of support scope | ||
| Red Hat Enterprise Linux 8 | postgresql | Not affected | ||
| Red Hat Enterprise Linux 8 | postgresql-jdbc | Not affected | ||
| Self-service automation portal 2 | ansible-automation-platform/bootc-automation-portal-rhel9 | Affected | ||
| Red Hat Enterprise Linux 10 | postgresql18 | Fixed | RHSA-2026:27742 | 22.06.2026 |
| Red Hat Enterprise Linux 10 | postgresql16 | Fixed | RHSA-2026:27743 | 22.06.2026 |
| Red Hat Enterprise Linux 10 | libpq | Fixed | RHSA-2026:44391 | 23.07.2026 |
| Red Hat Enterprise Linux 10.0 Extended Update Support | postgresql16 | Fixed | RHSA-2026:27718 | 22.06.2026 |
| Red Hat Enterprise Linux 10.0 Extended Update Support | libpq | Fixed | RHSA-2026:50863 | 05.08.2026 |
| Red Hat Enterprise Linux 7 Extended Lifecycle Support | postgresql | Fixed | RHSA-2026:49521 | 03.08.2026 |
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Дополнительная информация
Статус:
8.4 High
CVSS3
Связанные уязвимости
Use of inherently dangerous function PQfn(..., result_is_int=0, ...) in PostgreSQL libpq lo_export(), lo_read(), lo_lseek64(), and lo_tell64() functions allows the server superuser to overwrite a client stack buffer with an arbitrarily-large response. Like gets(), PQfn(..., result_is_int=0, ...) stores arbitrary-length, server-determined data into a buffer of unspecified size. Because both the \lo_export command in psql and pg_dump call lo_read(), the server superuser can overwrite pg_dump or psql stack memory. Versions before PostgreSQL 18.4, 17.10, 16.14, 15.18, and 14.23 are affected.
Use of inherently dangerous function PQfn(..., result_is_int=0, ...) in PostgreSQL libpq lo_export(), lo_read(), lo_lseek64(), and lo_tell64() functions allows the server superuser to overwrite a client stack buffer with an arbitrarily-large response. Like gets(), PQfn(..., result_is_int=0, ...) stores arbitrary-length, server-determined data into a buffer of unspecified size. Because both the \lo_export command in psql and pg_dump call lo_read(), the server superuser can overwrite pg_dump or psql stack memory. Versions before PostgreSQL 18.4, 17.10, 16.14, 15.18, and 14.23 are affected.
PostgreSQL libpq lo_* functions let server superuser overwrite client stack memory
Use of inherently dangerous function PQfn(..., result_is_int=0, ...) i ...
8.4 High
CVSS3