CVE Vulnerabilities

CVE-2023-52353

Session Fixation

Published: Jan 21, 2024 | Modified: May 30, 2025
CVSS 3.x
7.5
HIGH
Source:
NVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
CVSS 2.x
RedHat/V2
RedHat/V3
Ubuntu
MEDIUM

An issue was discovered in Mbed TLS through 3.5.1. In mbedtls_ssl_session_reset, the maximum negotiable TLS version is mishandled. For example, if the last connection negotiated TLS 1.2, then 1.2 becomes the new maximum.

Weakness

Authenticating a user, or otherwise establishing a new user session, without invalidating any existing session identifier gives an attacker the opportunity to steal authenticated sessions.

Affected Software

Name Vendor Start Version End Version
Mbed_tls Arm * 3.5.2 (excluding)
Mbedtls Ubuntu bionic *
Mbedtls Ubuntu focal *
Mbedtls Ubuntu lunar *
Mbedtls Ubuntu mantic *
Mbedtls Ubuntu oracular *
Mbedtls Ubuntu xenial *

Extended Description

Such a scenario is commonly observed when:

In the generic exploit of session fixation vulnerabilities, an attacker creates a new session on a web application and records the associated session identifier. The attacker then causes the victim to associate, and possibly authenticate, against the server using that session identifier, giving the attacker access to the user’s account through the active session.

Potential Mitigations

References