PT-2020-1237 · Libyang · Libyang

Jvijtiuko · Published 2020-01-22 · Updated 2023-09-20 · CVE-2019-20392

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 An invalid memory access flaw is present in the function resolve feature value() when an if-feature statement is used inside a list key node, and the feature used is not defined. 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 avoiding the use of if-feature statements inside list key nodes until a patch is available. Restrict access to untrusted input yang files to minimize the risk of exploitation.

Exploit

Fix

Buffer Overflow

Weakness Enumeration

CWE-119

Related Identifiers

ALEA-2021:1906

CVE-2019-20392

DLA-3572-1

Affected Products

Libyang

References · 24

• 🔥 https://github.com/CESNET/libyang/issues/723 · Exploit
• https://github.com/CESNET/libyang/commit/32fb4993bc8bb49e93e84016af3c10ea53964be5 · Patch
• https://security-tracker.debian.org/tracker/CVE-2019-20392 · Vendor Advisory
• https://bugzilla.redhat.com/show_bug.cgi?id=1793922 · Patch
• https://osv.dev/vulnerability/CVE-2019-20392 · Vendor Advisory
• https://osv.dev/vulnerability/DLA-3572-1 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2019-20392 · Security Note
• https://osv.dev/vulnerability/DEBIAN-CVE-2019-20392 · Vendor Advisory
• https://osv.dev/vulnerability/ALEA-2021:1906 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2019-20392 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2019-20392 · Security Note
• https://errata.almalinux.org/8/ALEA-2021-1906.html · Vendor Advisory
• https://ubuntu.com/security/CVE-2019-20392 · Vendor Advisory
• https://github.com/CESNET/libyang/compare/v0.16-r3...v1.0-r1 · Note
• https://vulners.com/cve/CVE-2019-20396 · Note