Google Chromium V8 Type Confusion
CVE-2020-6418 is a high-severity access of resource using incompatible type vulnerability in Chrome from Google, with a CVSS 3.1 base score of 8.8 out of 10. It can be exploited remotely over the network by an unauthenticated attacker, but only if a user takes part, for example by opening a link or file. The record lists version 80.0.3987.122 as the first without the flaw, so updating Chrome to that release or later removes the exposure. CISA added it to the Known Exploited Vulnerabilities catalogue on November 3, 2021, which means attacks have been observed in the wild.
Attackers are already exploiting this vulnerability, according to CISA.
What to do
- Update Chrome to 80.0.3987.122 or a later version.
- CISA's required action: Apply updates per vendor instructions.
- Read the advisory on chromereleases.googleblog.com for workarounds and exact fixed builds.
- Until you can update, restrict network access to the affected service so it is not reachable from untrusted networks.
- Because the attack needs a user to take part, warn users about unexpected links and files related to this product until it is patched.
Affected products and versions
| Vendor | Product | Affected versions | Fixed in |
|---|---|---|---|
| Chrome | before 80.0.3987.122 | 80.0.3987.122 | |
| Fedora Project | Fedora | 30; 31 | Not stated |
| Red Hat | Enterprise Linux Desktop | 6.0 | Not stated |
| Red Hat | Enterprise Linux Server | 6.0 | Not stated |
| Red Hat | Enterprise Linux Workstation | 6.0 | Not stated |
| Debian | Debian Linux | 9.0; 10.0 | Not stated |
Version data comes from the organisation that assigned the CVE. Confirm against the vendor advisory before deciding you are unaffected.
How the severity score breaks down
- Attack vector
- NetworkCan be exploited remotely over a network, including the internet.
- Attack complexity
- LowNo special conditions are needed; the attack works reliably.
- Privileges required
- NoneNo account or login is needed.
- User interaction
- RequiredA user must take an action such as opening a file or link.
- Scope
- UnchangedImpact stays within the vulnerable component.
- Confidentiality
- HighAll data handled by the component can be read.
- Integrity
- HighData or code can be modified at will.
- Availability
- HighThe component can be taken down completely.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H. Scored by NVD.
| Scoring system | Score | Severity | Scored by |
|---|---|---|---|
| CVSS 3.1 | 8.8 | High | NVD |
| CVSS 3.1 | 8.8 | High | CISA (ADP) |
| CVSS 2.0 | 6.8 | Medium | NVD |
Official description
Type confusion in V8 in Google Chrome prior to 80.0.3987.122 allowed a remote attacker to potentially exploit heap corruption via a crafted HTML page.
Source: the CVE record as published by its numbering authority, via NVD and CVE.org.
The underlying weakness: Access of Resource Using Incompatible Type
The product allocates or initializes a resource such as a pointer, object, or variable using one type, but it later accesses that resource using a type that is incompatible with the original type.
More Access of Resource Using Incompatible Type vulnerabilities (CWE-843)
Timeline
- CVE record published.
- Added to CISA's Known Exploited Vulnerabilities catalogue.
- Deadline for US federal agencies to remediate, set by CISA.
- CISA published its SSVC assessment (exploitation: active, automatable: no, technical impact: total).
- Record last changed materially (score, affected products, status or references).
References
Advisories
- chromereleases.googleblog.com/2020/02/stable-channel-update-for-desktop_24.htmlRelease Notes
- crbug.com/1053604Exploit, Issue Tracking
Patches and release notes
Third-party and government advisories
- access.redhat.com/errata/RHSA-2020:0738Third Party Advisory
- security.gentoo.org/glsa/202003-08Third Party Advisory
- debian.org/security/2020/dsa-4638Mailing List, Third Party Advisory
- cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2020-6418US Government Resource
Technical write-ups (may include proof of concept)
- packetstormsecurity.com/files/156632/Google-Chrome-80-JSCreate-Side-Effect-Type-Confusion.htmlExploit, Third Party Advisory, VDB Entry
Other vulnerabilities in Chrome
- 8.8 High severity
- 8.8 High severity
- 8.8 High severity
- 8.8 High severity
- 8.8 High severity
- 7.5 High severity
Recent Access of Resource Using Incompatible Type vulnerabilities
- 8.8 High severity
Apple Multiple Products Type Confusion Exploited
- 8.8 High severity
- 7.5 High severity
- 7.5 High severity
- 8.8 High severity
Google Chromium V8 Type Confusion Exploited
- 8.8 High severity
Adobe Flash Player Type Confusion Exploited
Spotted an error? Tell us.