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CVE-2019-20398

Good to know:

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Date: January 21, 2020

A NULL pointer dereference is present in libyang before v1.0-r3 in the function lys_extension_instances_free() due to a copy of unresolved extensions in lys_restr_dup(). Applications that use libyang to parse untrusted input yang files may crash.

Language: C

Severity Score

Related Resources (10)

https://lists.debian.org/debian-lts-announce/2023/09/msg00019.html
https://github.com/CESNET/libyang/commit/7852b272ef77f8098c35deea6c6f09cb78176f08
https://nvd.nist.gov/vuln/detail/CVE-2019-20398
https://bugzilla.redhat.com/show_bug.cgi?id=1793935
https://people.canonical.com/~ubuntu-security/cve/CVE-2019-20398
https://access.redhat.com/security/cve/CVE-2019-20398
https://github.com/CESNET/libyang/issues/773
https://github.com/CESNET/libyang/compare/v1.0-r2...v1.0-r3
https://security-tracker.debian.org/tracker/CVE-2019-20398
https://www.mend.io/vulnerability-database/CVE-2019-20398

Severity Score

Weakness Type (CWE)

NULL Pointer Dereference

CWE-476

Top Fix

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CVSS v3.1

Base Score:
Attack Vector (AV): NETWORK
Attack Complexity (AC): LOW
Privileges Required (PR): NONE
User Interaction (UI): REQUIRED
Scope (S): UNCHANGED
Confidentiality (C): NONE
Integrity (I): NONE
Availability (A): HIGH

CVSS v2

Base Score:
Access Vector (AV): NETWORK
Access Complexity (AC): MEDIUM
Authentication (AU): NONE
Confidentiality (C): NONE
Integrity (I): NONE
Availability (A): PARTIAL
Additional information:

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