Published: 13/06/2018 Updated: 30/06/2020

CVSS v2 Base Score: 4.3 | Impact Score: 2.9 | Exploitability Score: 8.6

CVSS v3 Base Score: 5.9 | Impact Score: 3.6 | Exploitability Score: 2.2

VMScore: 435

Vector: AV:N/AC:M/Au:N/C:N/I:P/A:N

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.

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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 c ...

A security issue has been found in Linux <= 4169, where an unprivileged attacker can hide a process from procps-ng's utilities by exploiting either a denial of service (a rather noisy method) or a race condition inherent in reading /proc/PID entries (a stealthier method) ...

Qualys Security Advisory Procps-ng Audit Report ======================================================================== Contents ======================================================================== Summary 1 FUSE-backed /proc/PID/cmdline 2 Unprivileged process hiding 3 Local Privilege Escalation in top (Low Impact) 4 Denial of Service ...

Qualys performed an extensive audit of procps-ng They discovered hundreds of bugs and vulnerabilities ...

CWE-362 https://www.qualys.com/2018/05/17/procps-ng-audit-report-advisory.txt https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-1121 http://seclists.org/oss-sec/2018/q2/122 https://www.exploit-db.com/exploits/44806/http://www.securityfocus.com/bid/104214 https://nvd.nist.gov https://www.exploit-db.com/exploits/44806/https://access.redhat.com/security/cve/cve-2018-1121

CVE-2018-1121

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