PT-2019-1107 · Libyang · Libyang

Jvijtiuko · Published 2019-03-29 · Updated 2023-09-20 · CVE-2019-20393

Positive Technologies (AI Summary)

CVSS v2.0

10

High

Base vector

AV:N/AC:L/Au:N/C:C/I:C/A:C

Name of the Vulnerable Software and Affected Versions: libyang versions prior to v1.0-r1

Description: A double-free issue is present in the yyparse() function when an empty description is used, potentially causing a crash or code execution. This issue affects applications that use libyang to parse untrusted input yang files. The flaw can be exploited by a remote attacker to execute arbitrary code or cause a denial of service.

Recommendations: For versions prior to v1.0-r1, update to version v1.0-r1 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. Avoid using empty descriptions in yang files to minimize the risk of exploitation.

Exploit

Fix

Double Free

Weakness Enumeration

CWE-415

Related Identifiers

ALEA-2021:1906

BDU:2024-04986

CVE-2019-20393

DLA-3572-1

Affected Products

Libyang

References · 27

• 🔥 https://github.com/CESNET/libyang/issues/742 · Exploit
• https://github.com/CESNET/libyang/commit/d9feacc4a590d35dbc1af21caf9080008b4450ed · Patch
• https://osv.dev/vulnerability/ALEA-2021:1906 · Vendor Advisory
• https://errata.almalinux.org/8/ALEA-2021-1906.html · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2019-20393 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2019-20393 · Security Note
• https://osv.dev/vulnerability/DLA-3572-1 · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2019-20393 · Vendor Advisory
• https://safe-surf.ru/upload/VULN-new/VULN.2024-06-17.1.pdf · Security Note
• https://bdu.fstec.ru/vul/2024-04986 · Security Note
• https://bugzilla.redhat.com/show_bug.cgi?id=1793930 · Patch
• https://osv.dev/vulnerability/DEBIAN-CVE-2019-20393 · Vendor Advisory
• https://ubuntu.com/security/CVE-2019-20393 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2019-20393 · Security Note
• https://osv.dev/vulnerability/CVE-2019-20393 · Vendor Advisory