Vulnerability in Procps Project
CVE-2018-1121
procps-ng, procps is vulnerable to a process hiding through race condition. Since the kernel's proc_pid_readdir() returns PID entries in ascending numeric order, a process occupying a high PID can use inotify events to determine when the process list is being scanned, and fork/exec to obtain a lower PID, thus avoiding enumeration. An unprivileged attacker can hide a process from procps-ng's utilities by exploiting a race condition in reading /proc/PID entries. This vulnerability affects procps and procps-ng up to version 3.3.15, newer versions might be affected also.
Vulnerability class: TOCTOU (Time-of-Check to Time-of-Use)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 3.9 (Low). Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:L.
EPSS exploit prediction
EPSS: 0.042 (90.6th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 91st percentile — 90.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.042 · newest: 0.042 · change: 0.000
Affected products
- Procps Project
- [Unknown] Procps-Ng, Procps — versions up to procps-ng 3.3.15 and newer
Weakness classification (CWE)
References
- www.exploit-db.com/exploits/44806/ (Exploit, VDB Entry, Third Party Advisory, exploit)
- bugzilla.redhat.com/show_bug.cgi (Third Party Advisory, Issue Tracking)
- www.securityfocus.com/bid/104214 (VDB Entry, Third Party Advisory, vdb-entry)
- seclists.org/oss-sec/2018/q2/122 (mailing-list, Exploit, Mailing List, Third Party Advisory)
- www.qualys.com/2018/05/17/procps-ng-audit-report-advisory.txt (Exploit, Third Party Advisory)
Frequently asked questions
- What is CVE-2018-1121?
- CVE-2018-1121 is a low-severity vulnerability in Procps Project, classified under Time-of-check Time-of-use (TOCTOU) Race Condition. CVSS score: 3.9/10. Published 2018-06-13.
- How severe is CVE-2018-1121?
- Low severity. CVSS v3 base score is 3.9 out of 10.