Vulnerability Details : CVE-2021-3935

When PgBouncer is configured to use "cert" authentication, a man-in-the-middle attacker can inject arbitrary SQL queries when a connection is first established, despite the use of TLS certificate verification and encryption. This flaw affects PgBouncer versions prior to 1.16.1.

Vulnerability category: Sql Injection

Published 2021-11-22 16:15:07

Updated 2023-06-26 19:15:17

Source Fedora Project

View at NVD, CVE.org

Exploit prediction scoring system (EPSS) score for CVE-2021-3935

Probability of exploitation activity in the next 30 days: 0.10%

Percentile, the proportion of vulnerabilities that are scored at or less: ~ 41 % EPSS Score History EPSS FAQ

CVSS scores for CVE-2021-3935

Base Score	Base Severity	CVSS Vector	Exploitability Score	Impact Score	Source
5.1	MEDIUM	AV:N/AC:H/Au:N/C:P/I:P/A:P	4.9	6.4	nvd@nist.gov
Access Vector: Network Access Complexity: High Authentication: None Confidentiality Impact: Partial Integrity Impact: Partial Availability Impact: Partial
8.1	HIGH	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H	2.2	5.9	nvd@nist.gov
Attack Vector: Network Attack Complexity: High Privileges Required: None User Interaction: None Scope: Unchanged Confidentiality: High Integrity: High Availability: High

CWE ids for CVE-2021-3935

CWE-89 Improper Neutralization of Special Elements used in an SQL Command ('SQL Injection')

The product constructs all or part of an SQL command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended SQL command when it is sent to a downstream component.
Assigned by:
- nvd@nist.gov (Primary)
- patrick@puiterwijk.org (Secondary)
CWE-295 Improper Certificate Validation

The product does not validate, or incorrectly validates, a certificate.

Assigned by: nvd@nist.gov (Primary)

References for CVE-2021-3935

https://lists.debian.org/debian-lts-announce/2022/02/msg00016.html

[SECURITY] [DLA 2922-1] pgbouncer security update
Mailing List;Third Party Advisory
http://www.pgbouncer.org/changelog.html#pgbouncer-116x

PgBouncer changelog
Release Notes;Vendor Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2021251

2021251 – (CVE-2021-3935) CVE-2021-3935 pgbouncer: server processes unencrypted bytes from man-in-the-middle
Issue Tracking;Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/TNPCV3KRDI5PLLLKADFVIOHACQJLZMLI/

[SECURITY] Fedora 35 Update: pgbouncer-1.16.1-1.fc35 - package-announce - Fedora Mailing-Lists
Mailing List;Third Party Advisory

CVEs referencing this url

Products affected by CVE-2021-3935

Debian » Debian Linux » Version: 9.0
cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*
Matching versions
Redhat » Enterprise Linux » Version: 7.0
cpe:2.3:o:redhat:enterprise_linux:7.0:*:*:*:*:*:*:*
Matching versions
Fedoraproject » Fedora » Version: 35
cpe:2.3:o:fedoraproject:fedora:35:*:*:*:*:*:*:*
Matching versions
Pgbouncer » Pgbouncer
Versions before (<) 1.16.1
cpe:2.3:a:pgbouncer:pgbouncer:*:*:*:*:*:*:*:*
Matching versions