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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 condition in reading /proc/PID entries. 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This CVE simply identifies a reliable way to do so using inotify.\n\nProcess accounting for security purposes, or with a requirement to record very short-running processes and those attempting to evade detection, should be performed with more robust methods such as auditd(8) (the Linux Audit Daemon) or systemtap.\n\nBecause an attacker can achieve similar results whether this vulnerability is present or not, Red Hat assesses its impact as Low."}], "providerMetadata": {"orgId": "53f830b8-0a3f-465b-8143-3b8a9948e749", "shortName": "redhat", "dateUpdated": "2018-05-17T17:00:00Z", "x_subShortName": "redhat_8"}}, {"metrics": [{"other": {"type": "Unknown", "content": {"data": "{\"description\":\"unimportant\"}"}}}], "affected": [{"vendor": "debian", "product": "linux", "platforms": ["bookworm", "forky", "sid", "trixie"], "defaultStatus": "unaffected"}], "references": [{"url": "https://security-tracker.debian.org/tracker/CVE-2018-1121"}], "descriptions": [{"lang": "en", "value": "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."}], "providerMetadata": {"orgId": "79363d38-fa19-49d1-9214-5f28da3f3ac5", "shortName": "debian", "dateUpdated": "2018-06-13T20:00:00.000Z", "x_subShortName": "debian"}}, {"metrics": [{"other": {"type": "Unknown", "content": {"data": "{\"description\":\"Low\"}"}}}], "affected": [{"vendor": "arch", "product": "linux", "versions": [{"status": "affected", "version": "4.16.9-1", "lessThan": "4.17.2-1", "versionType": "custom"}], "defaultStatus": "unaffected"}, {"vendor": "arch", "product": "linux-hardened", "versions": [{"status": "affected", "version": "4.16.9.a-1", "lessThan": "4.17a-1", "versionType": "custom"}], "defaultStatus": "unaffected"}, {"vendor": "arch", "product": "linux-lts", "versions": [{"status": "affected", "version": "4.14.41-1", "lessThan": "4.14.44-1", "versionType": "custom"}], "defaultStatus": "unaffected"}, {"vendor": "arch", "product": "linux-zen", "versions": [{"status": "affected", "version": "4.16.9-1", "lessThan": "4.17-1", "versionType": "custom"}], "defaultStatus": "unaffected"}], "references": [{"url": "https://security.archlinux.org/CVE-2018-1121"}], "descriptions": [{"lang": "en", "value": "A security issue has been found in Linux <= 4.16.9, 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)."}], "providerMetadata": {"orgId": "00000000-0000-4000-A000-000000000002", "shortName": "arch", "dateUpdated": "2019-09-25T19:31:40.000Z", "x_subShortName": "arch"}}], "cna": {"metrics": [{"format": "CVSS", "cvssV2_0": {"version": "2.0", "baseScore": 4.3, "accessVector": "NETWORK", "vectorString": "AV:N/AC:M/Au:N/C:N/I:P/A:N", "authentication": "NONE", "integrityImpact": "PARTIAL", "accessComplexity": "MEDIUM", "availabilityImpact": "NONE", "confidentialityImpact": "NONE"}}, {"format": "CVSS", "cvssV3_0": {"scope": "UNCHANGED", "version": "3.0", "baseScore": 5.9, "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "HIGH", "availabilityImpact": "NONE", "privilegesRequired": "NONE", "confidentialityImpact": "NONE"}}, {"format": "CVSS", "cvssV3_0": {"scope": "UNCHANGED", "version": "3.0", "baseScore": 3.9, "attackVector": "LOCAL", "baseSeverity": "LOW", "vectorString": "CVSS:3.0/AV:L/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:L", "integrityImpact": "LOW", "userInteraction": "REQUIRED", "attackComplexity": "LOW", "availabilityImpact": "LOW", "privilegesRequired": "LOW", "confidentialityImpact": "NONE"}}], "affected": [{"cpes": ["cpe:2.3:a:procps_project:procps:*:*:*:*:*:*:*:*"], "vendor": "procps_project", "product": "procps", "versions": [{"status": "affected", "version": "0", "versionType": "custom", "lessThanOrEqual": "3.3.15"}], "defaultStatus": "unaffected"}], "references": [{"url": "http://seclists.org/oss-sec/2018/q2/122", "tags": ["exploit", "mailing-list", "third-party-advisory"]}, {"url": "https://www.qualys.com/2018/05/17/procps-ng-audit-report-advisory.txt", "tags": ["exploit", "third-party-advisory"]}, {"url": "https://www.exploit-db.com/exploits/44806/", "tags": ["exploit", "third-party-advisory", "vdb-entry"]}, {"url": "https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-1121", "tags": ["issue-tracking", "third-party-advisory"]}, {"url": "http://www.securityfocus.com/bid/104214", "tags": ["third-party-advisory", "vdb-entry"]}], "descriptions": [{"lang": "en", "value": "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."}, {"lang": "es", "value": "procps-ng, procps son vulnerables a una ocultación de procesos mediante una condición de carrera. Debido a que el proc_pid_readdir() del kernel devuelve las entradas PID en orden numérico ascendente, un proceso que ocupe un PID alto puede emplear eventos inotify para determinar cuándo se está escaneando la lista de procesos y hacer un fork/exec para obtener un PID menor, evitando así la enumeración. Un atacante sin privilegios puede ocultar un proceso de las utilidades procps-ng mediante la explotación de una condición de carrera en la lectura de entradas /proc/PID. Esta vulnerabilidad afecta a procps y procps-ng hasta la versión 3.3.15; versiones posteriores también podrían haberse visto afectadas."}], "problemTypes": [{"descriptions": [{"lang": "en", "cweId": "CWE-362", "description": "CWE-362"}, {"lang": "en", "cweId": "CWE-367", "description": "CWE-367"}]}], "providerMetadata": {"orgId": "00000000-0000-4000-A000-000000000003", "shortName": "nvd", "dateUpdated": "2018-06-13T20:29:00Z", "x_subShortName": "nvd"}}}, "cveMetadata": {"cveId": "CVE-2018-1121", "state": "PUBLISHED", "dateUpdated": "2024-11-21T03:59:13Z", "assignerOrgId": "53f830b8-0a3f-465b-8143-3b8a9948e749", "datePublished": "2018-06-13T20:29:00Z", "assignerShortName": "redhat"}, "dataVersion": "5.0"}