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TI-2017-05381 Aliases CVE-2017-7761GHSA-mcm9-29wj-77v9

Incorrect default permissions in Mozilla Firefox ESR

Priority LOW 25CWE-276Published · Updated

Key facts

Attack vector
Local
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
—
Confidentiality · integrity · availability
None · High · None
Fix status
Fixed

Attack profile from CVSS 3.0 · NVD. Fix status from CNA.

Summary

The Mozilla Maintenance Service "helper.exe" application creates a temporary directory writable by non-privileged users. When this is combined with creation of a junction (a form of symbolic link), protected files in the target directory of the junction can be deleted by the Mozilla Maintenance Service, which has privileged access. Note: This attack requires local system access and only affects Windows. Other operating systems are not affected. This vulnerability affects Firefox ESR < 52.2 and Firefox < 54.

Why it matters now

EPSS 0.00305 23rd percentileScored 2026-11-07
Fix Fixed Firefox ESR (Mozilla): 52.2Firefox (Mozilla): 54

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
MozillaFirefox ESRbefore 52.252.2Patch availableCNA
MozillaFirefoxbefore 5454Patch availableCNA
  • Firefox ESR VendorMozilla Affected before 52.2 Fixed in 52.2 Patch available CNA
  • Firefox VendorMozilla Affected before 54 Fixed in 54 Patch available CNA

CPE configurations NVD · 2

CPEVersionsRoleVendor
cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*before 52.2.0; before 54.0VulnerableMozilla
cpe:2.3:o:microsoft:windows:-:*:*:*:*:*:*:*not specified by NVDRunning onMicrosoft
  • cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:* Versions before 52.2.0; before 54.0 Vulnerable ·Mozilla
  • cpe:2.3:o:microsoft:windows:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Microsoft

Remediation

  • Fix · CNA Firefox ESR (Mozilla) Fixed in 52.2
  • Fix · CNA Firefox (Mozilla) Fixed in 54

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Release ·

    Mozilla Firefox 54

    12 records Highest priority Priority MEDIUM 1 MEDIUM, 11 LOW

    Other records, highest priority first

    • TI-2017-03494 Memory corruption in Mozilla FirefoxPriority MEDIUM 46
    • TI-2017-05382 Improper input validation in Mozilla FirefoxPriority LOW 37
    • TI-2017-05375 Untrusted search path in Mozilla FirefoxPriority LOW 37
    Show all 12 records →
  • Release ·

    Mozilla Firefox ESR 52.2

    8 records Highest priority Priority LOW 8 LOW

    Other records, highest priority first

    • TI-2017-05375 Untrusted search path in Mozilla FirefoxPriority LOW 37
    • TI-2017-05385 Improper input validation in Mozilla FirefoxPriority LOW 36
    • TI-2017-05386 An attack using manipulation of "updater.ini" contents, used by the Mozilla Windows…Priority LOW 34
    Show all 8 records →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2017-7761
  2. 2026-10-03 Alias added: GHSA-mcm9-29wj-77v9

References

Advisory 4

  • TI-2024-08981 Use after free in Mozilla Firefox KEVCVSS 3.1CRITICAL 9.8
  • TI-2022-09832 Use after free in Mozilla Firefox KEVCVSS 3.1CRITICAL 9.6
  • TI-2019-08769 Improper input validation in Mozilla Firefox ESR KEVCVSS 3.1CRITICAL 10.0
  • TI-2010-03577 Mozilla Firefox 3.5.x through 3.5.14 and 3.6.x through 3.6.11, Thunderbird 3.1.6 before… KEVCVSS 3.1CRITICAL 9.8
  • TI-2023-04799 Out-of-bounds write in Google Chrome KEVCVSS 3.1HIGH 8.8
  • TI-2023-04477 Out-of-bounds write in Google Chrome KEVCVSS 3.1HIGH 8.8
See all 3444 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences