Link Following Affecting proftpd-dfsg package, versions <1.3.5b-4
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-DEBIAN12-PROFTPDDFSG-1557807
- published4 Apr 2017
- disclosed4 Apr 2017
Introduced: 4 Apr 2017
CVE-2017-7418 (opens in a new tab)How to fix?
Upgrade Debian:12 proftpd-dfsg to version 1.3.5b-4 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream proftpd-dfsg package and not the proftpd-dfsg package as distributed by Debian.
See How to fix? for Debian:12 relevant fixed versions and status.
ProFTPD before 1.3.5e and 1.3.6 before 1.3.6rc5 controls whether the home directory of a user could contain a symbolic link through the AllowChrootSymlinks configuration option, but checks only the last path component when enforcing AllowChrootSymlinks. Attackers with local access could bypass the AllowChrootSymlinks control by replacing a path component (other than the last one) with a symbolic link. The threat model includes an attacker who is not granted full filesystem access by a hosting provider, but can reconfigure the home directory of an FTP user.
References
- https://security-tracker.debian.org/tracker/CVE-2017-7418
- http://bugs.proftpd.org/show_bug.cgi?id=4295
- https://github.com/proftpd/proftpd/commit/ecff21e0d0e84f35c299ef91d7fda088e516d4ed
- https://github.com/proftpd/proftpd/commit/f59593e6ff730b832dbe8754916cb5c821db579f
- https://github.com/proftpd/proftpd/pull/444/commits/349addc3be4fcdad9bd4ec01ad1ccd916c898ed8
- http://lists.opensuse.org/opensuse-security-announce/2019-08/msg00004.html
- http://lists.opensuse.org/opensuse-security-announce/2019-08/msg00022.html
- http://www.securityfocus.com/bid/97409
- http://lists.opensuse.org/opensuse-security-announce/2020-01/msg00009.html
- http://people.ubuntu.com/~ubuntu-security/cve/CVE-2017-7418