Mozilla: Sandbox escape allowing local file system read access (MFSA 2017-12)
Published Jun 11, 2018
9.8
CRITICALCVSS 3.0
EPSS 2.78%
Description
A mechanism to bypass file system access protections in the sandbox using the file system request constructor through an IPC message. This allows for read and write access to the local file system. This vulnerability affects Firefox ESR < 52.1 and Firefox < 53.
Affected products
-
- Version unspecifiedStatusaffectedConstraints<53
- Version
-
- Version unspecifiedStatusaffectedConstraints<52.1
- Version
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | ||||||
|---|---|---|---|---|---|---|---|---|---|
| Mozilla | Firefox | n/a |
| ||||||
| Mozilla | Firefox ESR | n/a |
|
Configuration 1
- 7.0
- 7.0
- 7.0
- 7.3
- 7.4
- 7.3
- 7.4
- 7.5
- 7.0
No data.
Red Hat Enterprise Linux 7
firefox-0:52.1.0-2.el7_3
Fixed · RHSA-2017:1106
Red Hat Enterprise Linux 5
firefox
Will not fix
Red Hat Enterprise Linux 5
thunderbird
Not affected
Red Hat Enterprise Linux 6
firefox
Not affected
Red Hat Enterprise Linux 6
thunderbird
Not affected
Red Hat Enterprise Linux 7
thunderbird
Not affected
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 7 | firefox-0:52.1.0-2.el7_3 | Fixed | RHSA-2017:1106 |
| Red Hat Enterprise Linux 5 | firefox | Will not fix | n/a |
| Red Hat Enterprise Linux 5 | thunderbird | Not affected | n/a |
| Red Hat Enterprise Linux 6 | firefox | Not affected | n/a |
| Red Hat Enterprise Linux 6 | thunderbird | Not affected | n/a |
| Red Hat Enterprise Linux 7 | thunderbird | Not affected | n/a |
No package ranges for this CVE.
Remediation
No remediation recorded yet.
Metrics
No CVSS v4.0 score for this CVE.
No CVSS v3.1 score for this CVE.
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
AV:N/AC:L/Au:N/C:P/I:P/A:P
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
Score over time
2021–2026- EPSS v1
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Percentile over time
- EPSS v1
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Table of values (23 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 2.78% (0.02784) | 85.90th | v5 (v2026.06.15) |
| Jun 15, 2026 | 2.77% (0.02767) | 84.35th | v5 (v2026.06.15) |
| Nov 21, 2025 | 0.36% (0.00365) | 57.84th | v4 (v2025.03.14) |
| Nov 18, 2025 | 2.18% (0.02178) | 82.97th | v4 (v2025.03.14) |
| Aug 20, 2025 | 0.36% (0.00365) | 57.77th | v4 (v2025.03.14) |
| Mar 30, 2025 | 2.35% (0.02352) | 83.46th | v4 (v2025.03.14) |
| Mar 29, 2025 | 6.74% (0.06742) | 85.06th | v4 (v2025.03.14) |
| Mar 17, 2025 | 2.40% (0.02397) | 83.94th | v4 (v2025.03.14) |
| Dec 17, 2024 | 1.63% (0.01632) | 87.15th | v3 (v2023.03.01) |
| Jan 29, 2024 | 5.16% (0.05159) | 92.22th | v3 (v2023.03.01) |
| Nov 23, 2023 | 4.24% (0.04239) | 91.32th | v3 (v2023.03.01) |
| Nov 2, 2023 | 5.16% (0.05159) | 92.11th | v3 (v2023.03.01) |
| Jul 10, 2023 | 6.24% (0.06244) | 92.59th | v3 (v2023.03.01) |
| Jun 5, 2023 | 4.51% (0.04506) | 91.26th | v3 (v2023.03.01) |
| Mar 7, 2023 | 4.27% (0.04268) | 90.96th | v3 (v2023.03.01) |
| Mar 6, 2023 | 1.11% (0.01108) | 55.18th | v2 (v2022.01.01) |
| Sep 17, 2022 | 1.11% (0.01108) | 53.57th | v2 (v2022.01.01) |
| Apr 1, 2022 | 1.11% (0.01108) | 51.54th | v2 (v2022.01.01) |
| Feb 4, 2022 | 1.11% (0.01108) | 29.61th | v2 (v2022.01.01) |
| Feb 3, 2022 | 1.45% (0.01454) | 32.67th | v1 |
| Jan 6, 2022 | 1.45% (0.01454) | 31.96th | v1 |
| Sep 1, 2021 | 1.45% (0.01454) | 71.88th | v1 |
| Apr 14, 2021 | 1.45% (0.01454) | 0.00th | v1 |
References (11)
- http://www.securityfocus.com/bid/97940 vdb-entryx_refsource_BIDThird Party AdvisoryVDB Entry
- http://www.securitytracker.com/id/1038320 vdb-entryx_refsource_SECTRACKThird Party AdvisoryVDB Entry
- https://access.redhat.com/errata/RHSA-2017:1106 vendor-advisoryx_refsource_REDHATThird Party Advisory
- https://access.redhat.com/security/cve/CVE-2017-5456 Vendor Advisory
- https://bugzilla.mozilla.org/show_bug.cgi?id=1344415 x_refsource_CONFIRMExploitIssue TrackingPatchVendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1443297 Issue Tracking
- https://nvd.nist.gov/vuln/detail/CVE-2017-5456
- https://www.cve.org/CVERecord?id=CVE-2017-5456
- https://www.mozilla.org/en-US/security/advisories/mfsa2017-11/#CVE-2017-5456
- https://www.mozilla.org/security/advisories/mfsa2017-10/ x_refsource_CONFIRMVendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2017-12/ x_refsource_CONFIRMVendor Advisory
| Link | Providers | Tags |
|---|---|---|
| http://www.securityfocus.com/bid/97940 | vdb-entryx_refsource_BIDThird Party AdvisoryVDB Entry | |
| http://www.securitytracker.com/id/1038320 | vdb-entryx_refsource_SECTRACKThird Party AdvisoryVDB Entry | |
| https://access.redhat.com/errata/RHSA-2017:1106 | vendor-advisoryx_refsource_REDHATThird Party Advisory | |
| https://access.redhat.com/security/cve/CVE-2017-5456 | Vendor Advisory | |
| https://bugzilla.mozilla.org/show_bug.cgi?id=1344415 | x_refsource_CONFIRMExploitIssue TrackingPatchVendor Advisory | |
| https://bugzilla.redhat.com/show_bug.cgi?id=1443297 | Issue Tracking | |
| https://nvd.nist.gov/vuln/detail/CVE-2017-5456 | ||
| https://www.cve.org/CVERecord?id=CVE-2017-5456 | ||
| https://www.mozilla.org/en-US/security/advisories/mfsa2017-11/#CVE-2017-5456 | ||
| https://www.mozilla.org/security/advisories/mfsa2017-10/ | x_refsource_CONFIRMVendor Advisory | |
| https://www.mozilla.org/security/advisories/mfsa2017-12/ | x_refsource_CONFIRMVendor Advisory |
Change history (0)
No recorded changes yet.