GHSA-xgp9-j48h-jjf9 BIT-magento-2020-9690 CVE-2020-9690
Magento observable timing discrepancy vulnerability
- Severity
- 4.2 / 10
- Medium · CVSS 3.1
- Exploit chance (EPSS)
- 1.85%
- Chance of exploitation in the next 30 days. Higher than 79.07% of scored vulnerabilities.
- Known exploited
- No
- Not in CISA's catalog
- Weakness
- CWE-203 Observable Discrepancy
- Fix
2.3.5-p2- Upgrade magento/community-edition to this version or later
Description
Magento versions 2.3.5-p1 and earlier, and 2.3.5-p1 and earlier have an observable timing discrepancy vulnerability. Successful exploitation could lead to signature verification bypass.
Affected versions
Packagist
| Package | Vulnerable | Fixed in |
|---|---|---|
| magento/community-edition | < 2.3.5-p2 |
2.3.5-p2 |
How to fix
Move to the fixed version or later with your package manager, update the lockfile, and run your tests. If the package only arrives through another dependency, upgrade that dependency first. If none of its releases pulls a fixed version yet, force the version with your package manager's override.
magento/community-edition Packagist → 2.3.5-p2
- composer
composer require magento/community-edition:^2.3.5-p2
Severity breakdown
CVSS 3.1 4.2
CVSS:3.1/AV:L/AC:L/PR:H/UI:R/S:U/C:N/I:H/A:N
- Attack vector
- Local
- Attack complexity
- Low
- Privileges required
- High
- User interaction
- Required
- Scope
- Unchanged
- Confidentiality
- None
- Integrity
- High
- Availability
- None
Weakness
CWE-203: Observable Discrepancy
The product behaves differently or sends different responses under different circumstances in a way that is observable to an unauthorized actor.
How to prevent it
- Architecture and Design: Compartmentalize the system to have "safe" areas where trust boundaries can be unambiguously drawn. Do not allow sensitive data to go outside of the trust boundary and always be careful when interfacing with a compartment outside of the safe area. Ensure that appropriate compartmentalization is built into the system design, and the compartmentalization allows for and reinforces privilege separation functionality. Architects and designers should rely on the principle of least privilege to decide the appropriate time to use privileges and the time to drop privileges.
- Implementation: Ensure that error messages only contain minimal details that are useful to the intended audience and no one else. The messages need to strike the balance between being too cryptic (which can confuse users) or being too detailed (which may reveal more than intended). The messages should not reveal the methods that were used to determine the error. Attackers can use detailed information to refine or optimize their original attack, thereby increasing their chances of success. If errors must be captured in some detail, record them in log messages, but consider what could occur if the log messages can be viewed by attackers. Highly sensitive information such as passwords should never be saved to log files. Avoid inconsistent messaging that might accidentally tip off an attacker about internal state, such as whether a user account exists or not.
References
Advisories
Packages
Other links
Timeline
- Published
- Last updated by the source
- Latest EPSS score
Related advisories
| Advisory | Severity | Why it's related |
|---|---|---|
| GHSA-wh92-6q6g-px7j Magento Community Edition Improper Input Validation vulnerability | Critical Known exploited | Also affects magento/community-edition |
| GHSA-m8cj-3v68-3cxj Magento Open Source affected by an Improper Restriction of XML External Entity Reference ('XXE') vulnerability | Critical Known exploited | Also affects magento/community-edition |
| GHSA-f8fv-f786-9933 Magento improper input validation vulnerability | Critical Known exploited | Also affects magento/community-edition |
| GHSA-qvwr-p3hj-j6jf Magento vulnerable to privilege escalation due to incorrect authorization | Medium | Also affects magento/community-edition |
| GHSA-pcrx-r49h-x2w5 Magento vulnerable to stored Cross-Site Scripting (XSS) | Medium | Also affects magento/community-edition |
| GHSA-r355-75hw-r8jf Magento allows incorrect authorization | Medium | Also affects magento/community-edition |
| GHSA-2768-5wmv-cfff Magento vulnerable to stored Cross-Site Scripting (XSS) | High | Also affects magento/community-edition |
| GHSA-69x9-xp2j-w8g8 Magento provides incorrect authorization through a security feature bypass | High | Also affects magento/community-edition |
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