PT-2020-1239 · Libyang · Libyang

Juraj + 1 · CVE-2019-20395 · Published 2020-01-22 · Updated 2023-09-20

Positive Technologies (AI Summary)

CVSS v3.1

6.5

Medium

Base vector

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

Name of the Vulnerable Software and Affected Versions libyang versions prior to 1.0-r1

Description A stack consumption issue is present due to the self-referential union type containing leafrefs. Applications that use libyang to parse untrusted input yang files may crash.

Recommendations For versions prior to 1.0-r1, update to version 1.0-r1 or later to resolve the issue. As a temporary workaround, consider restricting the parsing of untrusted input yang files until a patch is available. Avoid using libyang to parse potentially malicious yang files to minimize the risk of exploitation.

Exploit

Fix

Uncontrolled Recursion

Weakness Enumeration

CWE-674

Related Identifiers

ALEA-2021:1906

CVE-2019-20395

DLA-3572-1

Affected Products

Libyang

References · 24

• 🔥 https://github.com/CESNET/libyang/issues/724 · Exploit
• https://osv.dev/vulnerability/DEBIAN-CVE-2019-20395 · Vendor Advisory
• https://osv.dev/vulnerability/DLA-3572-1 · Vendor Advisory
• https://ubuntu.com/security/CVE-2019-20395 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2019-20395 · Vendor Advisory
• https://osv.dev/vulnerability/ALEA-2021:1906 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2019-20395 · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2019-20395 · Vendor Advisory
• https://errata.almalinux.org/8/ALEA-2021-1906.html · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2019-20395 · Security Note
• https://cve.org/CVERecord?id=CVE-2019-20395 · Security Note
• https://github.com/CESNET/libyang/commit/4e610ccd87a2ba9413819777d508f71163fcc237 · Note
• https://github.com/CESNET/libyang/compare/v0.16-r3...v1.0-r1 · Note
• https://vulners.com/cve/CVE-2019-20396 · Note
• https://vulners.com/cve/CVE-2019-20394 · Note