A use-after-free vulnerability can occur while re-computing layout for a "marquee" element during window resizing where the updated style object is freed while still in use. This results in a potentially exploitable crash. This vulnerability affects Thunderbird < 52.3, Firefox ESR < 52.3, and Firefox < 55.
The MITRE CVE dictionary describes this issue as:
Find out more about CVE-2017-7801 from the MITRE CVE dictionary dictionary and NIST NVD.
| CVSS3 Base Score | 8.8 |
|---|---|
| CVSS3 Base Metrics | CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H |
| Attack Vector | Network |
| Attack Complexity | Low |
| Privileges Required | None |
| User Interaction | Required |
| Scope | Unchanged |
| Confidentiality | High |
| Integrity Impact | High |
| Availability Impact | High |
| Platform | Errata | Release Date |
|---|---|---|
| Red Hat Enterprise Linux 7 (firefox) | RHSA-2017:2456 | 2017-08-10 |
| Red Hat Enterprise Linux 6 (thunderbird) | RHSA-2017:2534 | 2017-08-24 |
| Red Hat Enterprise Linux 6 (firefox) | RHSA-2017:2456 | 2017-08-10 |
| Red Hat Enterprise Linux 7 (thunderbird) | RHSA-2017:2534 | 2017-08-24 |
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