CVE-2019-20394

A double-free is present in libyang before v1.0-r3 in the function yyparse() when a type statement in used in a notification statement. Applications that use libyang to parse untrusted input yang files may be vulnerable to this flaw, which would cause a crash or potentially code execution.

References

Affected packages

Git / github.com/cesnet/libyang

Affected ranges

Type: GIT
Repo: https://github.com/cesnet/libyang
Events: Introduced

0 Unknown introduced commit / All previous commits are affected

Fixed

6cc51b1757dfbb7cff92de074ada65e8523289a6

Affected versions

v0.*

v0.11-r1

v0.11-r2

v0.12-r1

v0.12-r2

v0.13-r1

v0.13-r2

v0.14-r1

v0.15-r1

v0.16-r1

v0.16-r2

v0.16-r3

v1.*

v1.0-r1

v1.0-r2

Database specific

vanir_signatures

[
    {
        "signature_type": "Function",
        "signature_version": "v1",
        "deprecated": false,
        "target": {
            "file": "src/parser_yang_bis.c",
            "function": "yyparse"
        },
        "source": "https://github.com/cesnet/libyang/commit/6cc51b1757dfbb7cff92de074ada65e8523289a6",
        "id": "CVE-2019-20394-41732613",
        "digest": {
            "function_hash": "334333495555913111835902825800076662424",
            "length": 121759.0
        }
    },
    {
        "signature_type": "Line",
        "signature_version": "v1",
        "deprecated": false,
        "target": {
            "file": "src/parser_yang_bis.c"
        },
        "source": "https://github.com/cesnet/libyang/commit/6cc51b1757dfbb7cff92de074ada65e8523289a6",
        "id": "CVE-2019-20394-c15508ec",
        "digest": {
            "line_hashes": [
                "164382308562417233091935855972747064438",
                "44550129803751250994624942069642899974",
                "132892422234432367498765861481733659786",
                "71028133021889715123863036278562934561"
            ],
            "threshold": 0.9
        }
    }
]

source

"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2019-20394.json"