PT-2017-17928 · Mozilla+2 · Firefox+2

Holger Fuhrmannek · Published 2017-06-13 · Updated 2019-10-03 · CVE-2017-7761

Positive Technologies (AI Summary)

CVSS v3.1

5.5

Medium

Base vector

AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N

Name of the Vulnerable Software and Affected Versions Firefox ESR versions prior to 52.2 Firefox versions prior to 54

Description The issue arises from the Mozilla Maintenance Service's "helper.exe" application creating a temporary directory that can be written to by non-privileged users. This can be exploited by creating a junction, a form of symbolic link, allowing protected files in the target directory to be deleted by the Mozilla Maintenance Service, which has privileged access. This attack requires local system access and is specific to Windows, with other operating systems not being affected.

Recommendations For Firefox ESR versions prior to 52.2, update to version 52.2 or later. For Firefox versions prior to 54, update to version 54 or later.

Fix

Incorrect Default Permissions

Weakness Enumeration

CWE-276

Related Identifiers

ALT-PU-2017-1770

ALT-PU-2017-1886

CVE-2017-7761

MGASA-2018-0018

OPENSUSE-SU-2017_1620-1

SUSE-SU-2017:1669-1

SUSE-SU-2017:2235-1

Affected Products

Alt Linux

Firefox

Suse

References · 89

• https://mozilla.org/en-US/security/advisories/mfsa2017-12 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2017-7761 · Security Note
• https://mozilla.org/en-US/security/advisories/mfsa2017-16 · Vendor Advisory
• https://mozilla.org/security/advisories/mfsa2017-15 · Vendor Advisory
• https://mozilla.org/en-US/security/advisories/mfsa2017-28 · Vendor Advisory
• https://osv.dev/vulnerability/MGASA-2018-0018 · Vendor Advisory
• https://advisories.mageia.org/MGASA-2018-0018.html · Security Note
• https://mozilla.org/en-US/security/advisories/mfsa2017-22 · Vendor Advisory
• https://osv.dev/vulnerability/SUSE-SU-2017:2235-1 · Vendor Advisory
• https://mozilla.org/security/advisories/mfsa2017-16 · Vendor Advisory
• https://mozilla.org/en-US/security/advisories/mfsa2017-25 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2017-7761 · Vendor Advisory
• https://mozilla.org/en-US/security/advisories/mfsa2017-05 · Vendor Advisory
• https://bugzilla.mozilla.org/show_bug.cgi?id=1215648 · Vendor Advisory
• https://osv.dev/vulnerability/SUSE-SU-2017:1669-1 · Vendor Advisory