Time-of-check Time-of-use (TOCTOU) Affecting procps-ng package, versions *
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
Do your applications use this vulnerable package?
In a few clicks we can analyze your entire application and see what components are vulnerable in your application, and suggest you quick fixes.
Test your applications- Snyk IDSNYK-RHEL7-PROCPSNG-1378486
- published26 Jul 2021
- disclosed17 May 2018
Introduced: 17 May 2018
CVE-2018-1121 (opens in a new tab)How to fix?
There is no fixed version for RHEL:7 procps-ng.
NVD Description
Note: Versions mentioned in the description apply only to the upstream procps-ng package and not the procps-ng package as distributed by RHEL.
See How to fix? for RHEL:7 relevant fixed versions and status.
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.
References
- http://www.securityfocus.com/bid/104214
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-1121
- https://access.redhat.com/security/cve/CVE-2018-1121
- https://www.exploit-db.com/exploits/44806/
- https://www.qualys.com/2018/05/17/procps-ng-audit-report-advisory.txt
- http://seclists.org/oss-sec/2018/q2/122