Vulnerability Details : 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.

Published 2018-06-13 20:29:00

Updated 2020-06-30 16:15:14

Source Red Hat, Inc.

View at NVD, CVE.org

Exploit prediction scoring system (EPSS) score for CVE-2018-1121

Probability of exploitation activity in the next 30 days: 0.18%

Percentile, the proportion of vulnerabilities that are scored at or less: ~ 55 % EPSS Score History EPSS FAQ

CVSS scores for CVE-2018-1121

Base Score	Base Severity	CVSS Vector	Exploitability Score	Impact Score	Source
4.3	MEDIUM	AV:N/AC:M/Au:N/C:N/I:P/A:N	8.6	2.9	nvd@nist.gov
Access Vector: Network Access Complexity: Medium Authentication: None Confidentiality Impact: None Integrity Impact: Partial Availability Impact: None
5.9	MEDIUM	CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N	2.2	3.6	nvd@nist.gov
Attack Vector: Network Attack Complexity: High Privileges Required: None User Interaction: None Scope: Unchanged Confidentiality: None Integrity: High Availability: None
3.9	LOW	CVSS:3.0/AV:L/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:L	1.3	2.5	secalert@redhat.com
Attack Vector: Local Attack Complexity: Low Privileges Required: Low User Interaction: Required Scope: Unchanged Confidentiality: None Integrity: Low Availability: Low

CWE ids for CVE-2018-1121

CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

The product contains a code sequence that can run concurrently with other code, and the code sequence requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence that is operating concurrently.

Assigned by: nvd@nist.gov (Primary)
CWE-367 Time-of-check Time-of-use (TOCTOU) Race Condition

The product checks the state of a resource before using that resource, but the resource's state can change between the check and the use in a way that invalidates the results of the check. This can cause the product to perform invalid actions when the resource is in an unexpected state.

Assigned by: secalert@redhat.com (Secondary)

References for CVE-2018-1121

https://www.exploit-db.com/exploits/44806/

Procps-ng - Multiple Vulnerabilities
Exploit;Third Party Advisory;VDB Entry

CVEs referencing this url
http://seclists.org/oss-sec/2018/q2/122

oss-sec: Qualys Security Advisory - Procps-ng Audit Report
Exploit;Mailing List;Third Party Advisory

CVEs referencing this url
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-1121

1575473 – (CVE-2018-1121) CVE-2018-1121 procps-ng, procps: process hiding through race condition enumerating /proc
Issue Tracking;Third Party Advisory
https://www.qualys.com/2018/05/17/procps-ng-audit-report-advisory.txt

Exploit;Third Party Advisory

CVEs referencing this url
http://www.securityfocus.com/bid/104214

Procps-ng Procps Multiple Security Vulnerabilities
Third Party Advisory;VDB Entry

CVEs referencing this url

Products affected by CVE-2018-1121

Procps Project » Procps
Versions up to, including, (<=) 3.3.15
cpe:2.3:a:procps_project:procps:*:*:*:*:*:*:*:*
Matching versions