{ "CVE_data_meta": { "ASSIGNER": "sirt@juniper.net", "DATE_PUBLIC": "2022-07-13T16:00:00.000Z", "ID": "CVE-2022-22215", "STATE": "PUBLIC", "TITLE": "Junos OS and Junos OS Evolved: /var/run/.env files are potentially not deleted during termination of a gRPC connection causing inode exhaustion" }, "affects": { "vendor": { "vendor_data": [ { "product": { "product_data": [ { "product_name": "Junos OS", "version": { "version_data": [ { "version_affected": "<", "version_value": "19.1R3-S8" }, { "version_affected": "<", "version_name": "19.2", "version_value": "19.2R3-S6" }, { "version_affected": "<", "version_name": "19.3", "version_value": "19.3R3-S5" }, { "version_affected": "<", "version_name": "19.4", "version_value": "19.4R2-S6, 19.4R3-S7" }, { "version_affected": ">=", "version_name": "20.1", "version_value": "20.1R1" }, { "version_affected": "<", "version_name": "20.2", "version_value": "20.2R3-S5" }, { "version_affected": "<", "version_name": "20.3", "version_value": "20.3R3-S4" }, { "version_affected": "<", "version_name": "20.4", "version_value": "20.4R3" }, { "version_affected": "<", "version_name": "21.1", "version_value": "21.1R3" }, { "version_affected": "<", "version_name": "21.2", "version_value": "21.2R2" } ] } }, { "product_name": "Junos OS Evolved", "version": { "version_data": [ { "version_affected": "<", "version_value": "20.4R3-EVO" }, { "version_affected": "<", "version_name": "21.1", "version_value": "21.1R3-S1-EVO" }, { "version_affected": "<", "version_name": "21.2", "version_value": "21.2R1-S1-EVO, 21.2R2-EVO" } ] } } ] }, "vendor_name": "Juniper Networks" } ] } }, "configuration": [ { "lang": "eng", "value": "To be affected by this issue the system needs to be configured for gRPC:\n\n [ system services extension-service request-response grpc ]" } ], "data_format": "MITRE", "data_type": "CVE", "data_version": "4.0", "description": { "description_data": [ { "lang": "eng", "value": "A Missing Release of File Descriptor or Handle after Effective Lifetime vulnerability in plugable authentication module (PAM) of Juniper Networks Junos OS and Junos OS Evolved allows a locally authenticated attacker with low privileges to cause a Denial of Service (DoS). It is possible that after the termination of a gRPC connection the respective/var/run/.env file is not getting deleted which if occurring repeatedly can cause inode exhaustion. Inode exhaustion can present itself in two different ways: 1. The following log message can be observed: host kernel: pid (), uid inumber on /.mount/var: out of inodes which by itself is a clear indication. 2. The following log message can be observed: host []: ... : No space left on device which is not deterministic and just a representation of a write error which could have several reasons. So the following check needs to be done: user@host> show system storage no-forwarding Filesystem Size Used Avail Capacity Mounted on /dev/ada1p1 475M 300M 137M 69% /.mount/var which indicates that the write error is not actually due to a lack of disk space. If either 1. or 2. has been confirmed, then the output of: user@host> file list /var/run/*.env | count need to be checked and if it indicates a high (>10000) number of files the system has been affected by this issue. This issue affects: Juniper Networks Junos OS All versions prior to 19.1R3-S8; 19.2 versions prior to 19.2R3-S6; 19.3 versions prior to 19.3R3-S5; 19.4 versions prior to 19.4R2-S6, 19.4R3-S7; 20.1 version 20.1R1 and later versions; 20.2 versions prior to 20.2R3-S5; 20.3 versions prior to 20.3R3-S4; 20.4 versions prior to 20.4R3; 21.1 versions prior to 21.1R3; 21.2 versions prior to 21.2R2. Juniper Networks Junos OS Evolved All versions prior to 20.4R3-EVO; 21.1 versions prior to 21.1R3-S1-EVO; 21.2 versions prior to 21.2R1-S1-EVO, 21.2R2-EVO." } ] }, "exploit": [ { "lang": "eng", "value": "Juniper SIRT is not aware of any malicious exploitation of this vulnerability." } ], "generator": { "engine": "Vulnogram 0.0.9" }, "impact": { "cvss": { "attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 6.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1" } }, "problemtype": { "problemtype_data": [ { "description": [ { "lang": "eng", "value": "775" } ] }, { "description": [ { "lang": "eng", "value": "Denial of Service (DoS)" } ] } ] }, "references": { "reference_data": [ { "name": "https://kb.juniper.net/JSA69719", "refsource": "CONFIRM", "url": "https://kb.juniper.net/JSA69719" } ] }, "solution": [ { "lang": "eng", "value": "The following software releases have been updated to resolve this specific issue: \nJunos OS: 19.1R3-S8, 19.2R3-S6, 19.3R3-S5, 19.4R2-S6, 19.4R3-S7, 20.2R3-S5, 20.3R3-S4, 20.4R3, 21.1R3, 21.2R2, 21.3R1, and all subsequent releases;\nJunos OS Evolved: 20.4R3-EVO, 21.1R3-S1-EVO, 21.2R1-S1-EVO, 21.2R2-EVO, 21.3R1-EVO, and all subsequent releases.\n" } ], "source": { "advisory": "JSA69719", "defect": [ "1604157" ], "discovery": "USER" }, "work_around": [ { "lang": "eng", "value": "There are no viable workarounds for this issue.\nTo reduce the risk of exploitation use access lists or firewall filters to the device only from trusted, administrative networks or hosts." } ] }