VDB-229385 · CVE-2023-23759 · GCVE-0-2023-23759

Facebook fizz prior 2023.01.30.00 ClientHello assertion

CVSS Meta Temp Score CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.	Current Exploit Price (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.	CTI Interest Score Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
6.4	$0-$5k	0.00

Summaryinfo

A vulnerability identified as problematic has been detected in Facebook fizz. This affects an unknown part of the component ClientHello Handler. The manipulation leads to assertion. This vulnerability is referenced as CVE-2023-23759. Remote exploitation of the attack is possible. No exploit is available. You should upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as problematic, has been found in Facebook fizz (Social Network Software). This issue affects some unknown functionality of the component ClientHello Handler. The manipulation with an unknown input leads to a assertion vulnerability. Using CWE to declare the problem leads to CWE-617. The product contains an assert() or similar statement that can be triggered by an attacker, which leads to an application exit or other behavior that is more severe than necessary. Impacted is availability. The summary by CVE is:

There is a vulnerability in the fizz library prior to v2023.01.30.00 where a CHECK failure can be triggered remotely. This behavior requires the client supported cipher advertisement changing between the original ClientHello and the second ClientHello, crashing the process (impact is limited to denial of service).

The weakness was published 05/19/2023. The advisory is shared at facebook.com. The identification of this vulnerability is CVE-2023-23759 since 01/17/2023. Neither technical details nor an exploit are publicly available.

Upgrading to version 2023.01.30.00 eliminates this vulnerability. Applying the patch 8d3649841597bedfb6986c30431ebad0eb215265 is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Type

Social Network Software

Vendor

Facebook

Name

fizz

License

free

CPE 2.3info

🔍

CPE 2.2info

🔍

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.4
VulDB Meta Temp Score: 6.4

VulDB Base Score: 4.3
VulDB Temp Score: 4.1
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 7.5
NVD Vector: 🔍

CNA Base Score: 7.5
CNA Vector: 🔍

CVSSv2info

AV	AC	Au	C	I	A
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳

Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock

VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

Exploitinginfo

Class: Assertion
CWE: CWE-617
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: fizz 2023.01.30.00
Patch: 8d3649841597bedfb6986c30431ebad0eb215265

Timelineinfo

01/17/2023 🔍
05/19/2023 +121 days 🔍
05/19/2023 +0 days 🔍
01/21/2025 +613 days 🔍

Sourcesinfo

Advisory: 8d3649841597bedfb6986c30431ebad0eb215265
Status: Confirmed

CVE: CVE-2023-23759 (🔍)
GCVE (CVE): GCVE-0-2023-23759
GCVE (VulDB): GCVE-100-229385

Entryinfo

Created: 05/19/2023 07:01
Updated: 01/21/2025 23:47
Changes: 05/19/2023 07:01 (41), 06/14/2023 08:01 (1), 06/14/2023 08:08 (11), 01/21/2025 23:47 (26)
Complete: 🔍
Cache ID: 216::103