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
Configurations
History
27 May 2026, 14:42
| Type | Values Removed | Values Added |
|---|---|---|
| CPE | cpe:2.3:a:pavel-odintsov:fastnetmon:*:*:*:*:community:*:*:* | |
| First Time |
Pavel-odintsov
Pavel-odintsov fastnetmon |
|
| References | () https://github.com/pavel-odintsov/fastnetmon - Product | |
| References | () https://github.com/pavel-odintsov/fastnetmon/blob/master/src/fastnetmon.cpp - Product | |
| References | () https://github.com/pavel-odintsov/fastnetmon/blob/master/src/fastnetmon_logic.cpp - Product | |
| References | () https://lorikeetsecurity.com/blog/fastnetmon-cve-2026-48693-symlink-tmp - Third Party Advisory |
26 May 2026, 21:16
| Type | Values Removed | Values Added |
|---|---|---|
| CVSS |
v2 : v3 : |
v2 : unknown
v3 : 5.5 |
| CWE | CWE-59 |
26 May 2026, 17:16
| Type | Values Removed | Values Added |
|---|---|---|
| New CVE |
Information
Published : 2026-05-26 17:16
Updated : 2026-05-27 14:42
NVD link : CVE-2026-48693
Mitre link : CVE-2026-48693
CVE.ORG link : CVE-2026-48693
JSON object : View
Products Affected
pavel-odintsov
- fastnetmon
CWE
CWE-59
Improper Link Resolution Before File Access ('Link Following')