DEBIAN-CVE-2026-48693
- Source
- https://security-tracker.debian.org/tracker/CVE-2026-48693
- Import Source
- https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-48693.json
- JSON Data
- https://api.osv.dev/v1/vulns/DEBIAN-CVE-2026-48693
- Upstream
- Published
- 2026-05-26T17:16:53Z
- Modified
- 2026-09-14T17:03:16Z
- Severity
-
- 5.5 (Medium) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N CVSS Calculator
- Summary
- [none]
- Details
-
FastNetMon Community Edition through 1.2.9 is vulnerable to a local symlink attack via predictable file paths in /tmp. The statistics file path defaults to '/tmp/fastnetmon.dat' (src/fastnetmon.cpp line 159). The print_screen_contents_into_file() function (src/fastnetmon_logic.cpp line 2186) opens this path with std::ios::trunc without checking for symlinks or using O_NOFOLLOW. Additionally, the chmod() call on line 2190 always operates on cli_stats_file_path regardless of which file_path parameter was passed (a bug that applies wrong permissions), and the umask is set to 0 during daemonization (src/fastnetmon.cpp line 1821), making all created files world-writable. A local attacker can exploit this to overwrite arbitrary files as the FastNetMon process user (typically root).
- References
Affected packages
Debian:12 / fastnetmon
Package
- Name
- fastnetmon
- Purl
- pkg:deb/debian/fastnetmon?arch=source&distro=bookworm
Affected ranges
- Type
- ECOSYSTEM
- Events
-
Introduced0 Unknown introduced version / All previous versions are affected
Debian:13 / fastnetmon
Package
- Name
- fastnetmon
- Purl
- pkg:deb/debian/fastnetmon?arch=source&distro=trixie
Debian:14 / fastnetmon
Package
- Name
- fastnetmon
- Purl
- pkg:deb/debian/fastnetmon?arch=source&distro=forky