Sabberworm PHP CSS Parser up to 8.3.0 allSelectors/getSelectorsBySpecificity code injection

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.
8.4$0-$5k0.00

Summaryinfo

A vulnerability classified as critical has been found in Sabberworm PHP CSS Parser up to 8.3.0. Affected is the function allSelectors/getSelectorsBySpecificity. This manipulation causes input validation. This vulnerability is handled as CVE-2020-13756. The attack can be initiated remotely. There is not any exploit available. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability has been found in Sabberworm PHP CSS Parser up to 8.3.0 (Programming Language Software) and classified as critical. Affected by this vulnerability is the function allSelectors/getSelectorsBySpecificity. The manipulation with an unknown input leads to a input validation vulnerability. The CWE definition for the vulnerability is CWE-94. The product constructs all or part of a code segment using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the syntax or behavior of the intended code segment. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

Sabberworm PHP CSS Parser before 8.3.1 calls eval on uncontrolled data, possibly leading to remote code execution if the function allSelectors() or getSelectorsBySpecificity() is called with input from an attacker.

The weakness was released 06/03/2020. This vulnerability is known as CVE-2020-13756 since 06/01/2020. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Technical details are known, but no exploit is available. MITRE ATT&CK project uses the attack technique T1059 for this issue.

The vulnerability scanner Nessus provides a plugin with the ID 235491 (Ubuntu 16.04 LTS / 18.04 LTS : Horde Css Parser vulnerability (USN-7502-1)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 8.3.1 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (235491). Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Type

Vendor

Name

Version

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 8.5
VulDB Meta Temp Score: 8.4

VulDB Base Score: 7.3
VulDB Temp Score: 7.0
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 9.8
NVD Vector: 🔍

CVSSv2info

AVACAuCIA
💳💳💳💳💳💳
💳💳💳💳💳💳
💳💳💳💳💳💳
VectorComplexityAuthenticationConfidentialityIntegrityAvailability
UnlockUnlockUnlockUnlockUnlockUnlock
UnlockUnlockUnlockUnlockUnlockUnlock
UnlockUnlockUnlockUnlockUnlockUnlock

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

NVD Base Score: 🔍

Exploitinginfo

Class: Code injection
CWE: CWE-94 / CWE-74 / CWE-707
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-DayUnlockUnlockUnlockUnlock
TodayUnlockUnlockUnlockUnlock

Nessus ID: 235491
Nessus Name: Ubuntu 16.04 LTS / 18.04 LTS : Horde Css Parser vulnerability (USN-7502-1)

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: PHP CSS Parser 8.3.1

Timelineinfo

06/01/2020 🔍
06/03/2020 +2 days 🔍
06/04/2020 +1 days 🔍
11/03/2025 +1978 days 🔍

Sourcesinfo

Status: Confirmed

CVE: CVE-2020-13756 (🔍)
GCVE (CVE): GCVE-0-2020-13756
GCVE (VulDB): GCVE-100-156001

Entryinfo

Created: 06/04/2020 09:47
Updated: 11/03/2025 19:33
Changes: 06/04/2020 09:47 (37), 06/04/2020 09:52 (18), 05/08/2025 16:30 (20), 11/03/2025 19:33 (2)
Complete: 🔍
Cache ID: 216::103

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

Discussion

No comments yet. Languages: en.

Please log in to comment.

◂ PreviousOverviewNext ▸

Do you want to use VulDB in your project?

Use the official API to access entries easily!