CVE-2017-7761

NameCVE-2017-7761
DescriptionThe 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.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, bugtraq, EDB, Metasploit, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, Mageia, GitHub code/issues, web search, more)
NVD severitylow

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
firefox (PTS)sid70.0.1-1fixed
firefox-esr (PTS)jessie52.8.1esr-1~deb8u1fixed
jessie (security)68.2.0esr-1~deb8u1fixed
stretch60.7.1esr-1~deb9u1fixed
stretch (security)68.2.0esr-1~deb9u2fixed
buster, buster (security)68.2.0esr-1~deb10u1fixed
bullseye, sid68.2.0esr-1fixed

The information below is based on the following data on fixed versions.

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
firefoxsource(unstable)(not affected)
firefox-esrsource(unstable)(not affected)

Notes

- firefox <not-affected> (Only Firefox on Windows)
- firefox-esr <not-affected> (Only Firefox ESR on Windows)
https://www.mozilla.org/en-US/security/advisories/mfsa2017-15/#CVE-2017-7761
https://www.mozilla.org/en-US/security/advisories/mfsa2017-16/#CVE-2017-7761

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