PT-2020-1238 · Libyang · Libyang

Jvijtiuko · Published 2020-01-22 · Updated 2023-09-20 · CVE-2019-20394

Positive Technologies (AI Summary)

CVSS v3.1

8.8

High

Base vector

AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Name of the Vulnerable Software and Affected Versions libyang versions prior to v1.0-r3

Description A double-free issue is present in the yyparse() function when a type statement is used in a notification statement. This affects applications that use libyang to parse untrusted input yang files, potentially causing a crash or code execution.

Recommendations For versions prior to v1.0-r3, update to version v1.0-r3 or later to resolve the issue. As a temporary workaround, consider restricting the use of the yyparse() function when parsing untrusted input yang files until a patch is available.

Exploit

Fix

Double Free

Weakness Enumeration

CWE-415

Related Identifiers

ALEA-2021:1906

CVE-2019-20394

DLA-3572-1

Affected Products

Libyang

References · 24

• 🔥 https://github.com/CESNET/libyang/issues/769 · Exploit
• https://github.com/CESNET/libyang/commit/6cc51b1757dfbb7cff92de074ada65e8523289a6 · Patch
• https://osv.dev/vulnerability/CVE-2019-20394 · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2019-20394 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2019-20394 · Security Note
• https://osv.dev/vulnerability/DLA-3572-1 · Vendor Advisory
• https://osv.dev/vulnerability/ALEA-2021:1906 · Vendor Advisory
• https://ubuntu.com/security/CVE-2019-20394 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2019-20394 · Vendor Advisory
• https://bugzilla.redhat.com/show_bug.cgi?id=1793932 · Patch
• https://security-tracker.debian.org/tracker/CVE-2019-20394 · Vendor Advisory
• https://errata.almalinux.org/8/ALEA-2021-1906.html · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2019-20394 · Security Note
• https://github.com/CESNET/libyang/compare/v1.0-r2...v1.0-r3 · Note
• https://vulners.com/cve/CVE-2019-20396 · Note