Double Free in libyang - CVE-2019-20393
Published: January 22, 2020 / Updated: August 8, 2020
Vulnerability identifier: #VU34863
CSH Severity: High
CVSS v4: 8.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2019-20393
CWE-ID: CWE-415
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote non-authenticated attacker to execute arbitrary code.
A double-free is present in libyang before v1.0-r1 in the function yyparse() when an empty description is used. Applications that use libyang to parse untrusted input yang files may be vulnerable to this flaw, which would cause a crash or potentially code execution.
Affected software
libyang
Dell EMC PowerProtect Data Protection
SmartFabric OS10
Red Hat Enterprise Linux for x86_64
libyang (Red Hat package)
Dell EMC PowerProtect Data Protection
SmartFabric OS10
Red Hat Enterprise Linux for x86_64
libyang (Red Hat package)
How to mitigate CVE-2019-20393
Install update from vendor's website.
Dell EMC PowerProtect Data Protection - update to 2.7.8
SmartFabric OS10 - addressed in versions 10.5.5.9, 10.5.6.1
libyang (Red Hat package) - update to 1.0.184-1.el8
SmartFabric OS10 - addressed in versions 10.5.5.9, 10.5.6.1
libyang (Red Hat package) - update to 1.0.184-1.el8