Vulnerabilities > CVE-2018-1121 - Race Condition vulnerability in Procps Project Procps
Attack vector
NETWORK Attack complexity
HIGH Privileges required
NONE Confidentiality impact
NONE Integrity impact
HIGH Availability impact
NONE Summary
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.
Vulnerable Configurations
Common Weakness Enumeration (CWE)
Common Attack Pattern Enumeration and Classification (CAPEC)
- Leveraging Race Conditions This attack targets a race condition occurring when multiple processes access and manipulate the same resource concurrently and the outcome of the execution depends on the particular order in which the access takes place. The attacker can leverage a race condition by "running the race", modifying the resource and modifying the normal execution flow. For instance a race condition can occur while accessing a file, the attacker can trick the system by replacing the original file with his version and cause the system to read the malicious file.
- Leveraging Time-of-Check and Time-of-Use (TOCTOU) Race Conditions This attack targets a race condition occurring between the time of check (state) for a resource and the time of use of a resource. The typical example is the file access. The attacker can leverage a file access race condition by "running the race", meaning that he would modify the resource between the first time the target program accesses the file and the time the target program uses the file. During that period of time, the attacker could do something such as replace the file and cause an escalation of privilege.
Exploit-Db
| description | Procps-ng - Multiple Vulnerabilities. CVE-2018-1120,CVE-2018-1121,CVE-2018-1122,CVE-2018-1123,CVE-2018-1124. Local exploit for Linux platform. Tags: Denial o... |
| file | exploits/linux/local/44806.txt |
| id | EDB-ID:44806 |
| last seen | 2018-05-30 |
| modified | 2018-05-30 |
| platform | linux |
| port | |
| published | 2018-05-30 |
| reporter | Exploit-DB |
| source | https://www.exploit-db.com/download/44806/ |
| title | Procps-ng - Multiple Vulnerabilities |
| type | local |
Packetstorm
| data source | https://packetstormsecurity.com/files/download/147806/qualys-procps-ng-audit-report.txt |
| id | PACKETSTORM:147806 |
| last seen | 2018-05-24 |
| published | 2018-05-22 |
| reporter | qualys.com |
| source | https://packetstormsecurity.com/files/147806/Procps-ng-Audit-Report.html |
| title | Procps-ng Audit Report |
References
- http://seclists.org/oss-sec/2018/q2/122
- http://seclists.org/oss-sec/2018/q2/122
- http://www.securityfocus.com/bid/104214
- http://www.securityfocus.com/bid/104214
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-1121
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-1121
- https://www.exploit-db.com/exploits/44806/
- https://www.exploit-db.com/exploits/44806/
- https://www.qualys.com/2018/05/17/procps-ng-audit-report-advisory.txt
- https://www.qualys.com/2018/05/17/procps-ng-audit-report-advisory.txt