In all versions of libyang before 1.0-r5, a stack-based buffer overflow was discovered in the way libyang parses YANG files with a leaf of type "identityref". An application that uses libyang to parse untrusted YANG files may be vulnerable to this flaw, which would allow an attacker to cause a denial of service or possibly gain code execution.
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An application that uses libyang to parse untrusted YANG files may be vulnerable to this flaw, which would allow an attacker to cause a denial of service or execute code.\n", "cvss3": {"exploitabilityScore": 3.9, "cvssV3": {"baseSeverity": "CRITICAL", "confidentialityImpact": "HIGH", "attackComplexity": "LOW", "scope": "UNCHANGED", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "baseScore": 9.8, "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1", "userInteraction": "NONE"}, "impactScore": 5.9}, "published": "2019-12-06T08:17:57", "type": "redhatcve", "title": "CVE-2019-19334", "bulletinFamily": "info", "cvss2": {"severity": "HIGH", "exploitabilityScore": 10.0, "obtainAllPrivilege": false, "userInteractionRequired": false, "obtainOtherPrivilege": false, "cvssV2": {"accessComplexity": "LOW", "confidentialityImpact": "PARTIAL", "availabilityImpact": "PARTIAL", "integrityImpact": "PARTIAL", "baseScore": 7.5, "vectorString": "AV:N/AC:L/Au:N/C:P/I:P/A:P", "version": "2.0", "accessVector": "NETWORK", "authentication": "NONE"}, "impactScore": 6.4, "acInsufInfo": false, "obtainUserPrivilege": false}, "cvelist": ["CVE-2019-19334"], "modified": "2023-04-06T06:33:33", "id": "RH:CVE-2019-19334", "href": "https://access.redhat.com/security/cve/cve-2019-19334", "cvss": {"score": 7.5, "vector": "AV:N/AC:L/Au:N/C:P/I:P/A:P"}}], "debiancve": [{"lastseen": "2023-06-13T18:11:55", "description": "In all versions of libyang before 1.0-r5, a stack-based buffer overflow was discovered in the way libyang parses YANG files with a leaf of type \"identityref\". An application that uses libyang to parse untrusted YANG files may be vulnerable to this flaw, which would allow an attacker to cause a denial of service or possibly gain code execution.", "cvss3": {"exploitabilityScore": 3.9, "cvssV3": {"baseSeverity": "CRITICAL", "confidentialityImpact": "HIGH", "attackComplexity": "LOW", "scope": "UNCHANGED", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "baseScore": 9.8, "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1", "userInteraction": "NONE"}, "impactScore": 5.9}, "published": "2019-12-06T16:15:00", "type": "debiancve", "title": "CVE-2019-19334", "bulletinFamily": "info", "cvss2": {"severity": "HIGH", "exploitabilityScore": 10.0, "obtainAllPrivilege": false, "userInteractionRequired": false, "obtainOtherPrivilege": false, "cvssV2": {"accessComplexity": "LOW", "confidentialityImpact": "PARTIAL", "availabilityImpact": "PARTIAL", "integrityImpact": "PARTIAL", "baseScore": 7.5, "vectorString": "AV:N/AC:L/Au:N/C:P/I:P/A:P", "version": "2.0", "accessVector": "NETWORK", "authentication": "NONE"}, "impactScore": 6.4, "acInsufInfo": false, "obtainUserPrivilege": false}, "cvelist": ["CVE-2019-19334"], "modified": "2019-12-06T16:15:00", "id": "DEBIANCVE:CVE-2019-19334", "href": "https://security-tracker.debian.org/tracker/CVE-2019-19334", "cvss": {"score": 7.5, "vector": "AV:N/AC:L/Au:N/C:P/I:P/A:P"}}], "ubuntucve": [{"lastseen": "2023-06-14T13:55:24", "description": "In all versions of libyang before 1.0-r5, a stack-based buffer overflow was\ndiscovered in the way libyang parses YANG files with a leaf of type\n\"identityref\". An application that uses libyang to parse untrusted YANG\nfiles may be vulnerable to this flaw, which would allow an attacker to\ncause a denial of service or possibly gain code execution.\n\n#### Bugs\n\n * <http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=946217>\n", "cvss3": {"exploitabilityScore": 3.9, "cvssV3": {"baseSeverity": "CRITICAL", "confidentialityImpact": "HIGH", "attackComplexity": "LOW", "scope": "UNCHANGED", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "baseScore": 9.8, "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1", "userInteraction": "NONE"}, "impactScore": 5.9}, "published": "2019-12-06T00:00:00", "type": "ubuntucve", "title": "CVE-2019-19334", "bulletinFamily": "info", "cvss2": {"severity": "HIGH", "exploitabilityScore": 10.0, "obtainAllPrivilege": false, "userInteractionRequired": false, "obtainOtherPrivilege": false, "cvssV2": {"accessComplexity": "LOW", "confidentialityImpact": "PARTIAL", "availabilityImpact": "PARTIAL", "integrityImpact": "PARTIAL", "baseScore": 7.5, "vectorString": "AV:N/AC:L/Au:N/C:P/I:P/A:P", "version": "2.0", "accessVector": "NETWORK", "authentication": "NONE"}, "impactScore": 6.4, "acInsufInfo": false, "obtainUserPrivilege": false}, "cvelist": ["CVE-2019-19334"], "modified": "2019-12-06T00:00:00", "id": "UB:CVE-2019-19334", "href": "https://ubuntu.com/security/CVE-2019-19334", "cvss": {"score": 7.5, "vector": "AV:N/AC:L/Au:N/C:P/I:P/A:P"}}], "redhat": [{"lastseen": "2023-08-04T12:28:04", "description": "The libyang package provides a library for YANG data modeling language. libyang is a YANG data modelling language parser and toolkit written (and providing API) in C. 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An attacker can exploit these issues to execute arbitrary code in the context of an affected system. Failed exploit attempts may result in a denial-of-service condition. Versions prior to CESNET libyang 1.0-r5 are vulnerable.\n\n### Technologies Affected\n\n * CESNET libyang 0.11-r1 \n * CESNET libyang 0.12-r1 \n * CESNET libyang 0.13-r1 \n * CESNET libyang 0.14-r1 \n * CESNET libyang 0.15-r1 \n * CESNET libyang 0.16-r1 \n * CESNET libyang 1.0-r1 \n * CESNET libyang 1.0-r2 \n * CESNET libyang 1.0-r4 \n * Redhat Enterprise Linux 8 \n\n### Recommendations\n\n**Block external access at the network boundary, unless external parties require service.** \nIf global access isn't needed, filter access to the affected computer at the network boundary. Restricting access to only trusted computers and networks might greatly reduce the likelihood of successful exploits. \n\n**Run all software as a nonprivileged user with minimal access rights.** \nRun all non-administrative software as a non-administrative user with the least amount of privileges required to successfully operate. This will greatly reduce the potential damage that successful exploitation may achieve. \n\n**Deploy network intrusion detection systems to monitor network traffic for malicious activity.** \nDeploy NIDS to monitor network traffic for signs of anomalous or suspicious activity. This includes but is not limited to requests that include NOP sleds and unexplained incoming and outgoing traffic. This may indicate exploit attempts or activity that results from successful exploits. \n\n**Implement multiple redundant layers of security.** \nVarious memory-protection schemes (such as nonexecutable and randomly mapped memory segments) may hinder an attacker's ability to exploit this vulnerability to execute arbitrary code. \n\nUpdates are available. Please see the references or vendor advisory for more information.\n", "cvss3": {}, "published": "2019-12-04T00:00:00", "type": "symantec", "title": "CESNET libyang Multiple Stack Based Buffer Overflow Vulnerabilities", "bulletinFamily": "software", "cvss2": {}, "cvelist": ["CVE-2019-19334", "CVE-2019-19333"], "modified": "2019-12-04T00:00:00", "id": "SMNTC-111190", "href": "https://www.symantec.com/content/symantec/english/en/security-center/vulnerabilities/writeup.html/111190", "cvss": {"score": 7.5, "vector": "AV:N/AC:L/Au:N/C:P/I:P/A:P"}}]}
CVE-2019-19334
