Vulnerability CVE-2019-20398
Published: 2020-01-22   Modified: 2020-01-23

Description:
A NULL pointer dereference is present in libyang before v1.0-r3 in the function lys_extension_instances_free() due to a copy of unresolved extensions in lys_restr_dup(). Applications that use libyang to parse untrusted input yang files may crash.

Type:

CWE-476

 (NULL Pointer Dereference)

CVSS2 => (AV:N/AC:M/Au:N/C:N/I:N/A:P)

CVSS Base Score
Impact Subscore
Exploitability Subscore
4.3/10
2.9/10
8.6/10
Exploit range
Attack complexity
Authentication
Remote
Medium
No required
Confidentiality impact
Integrity impact
Availability impact
None
None
Partial
Affected software
Cesnet -> Libyang 

 References:
https://bugzilla.redhat.com/show_bug.cgi?id=1793935
https://github.com/CESNET/libyang/commit/7852b272ef77f8098c35deea6c6f09cb78176f08
https://github.com/CESNET/libyang/compare/v1.0-r2...v1.0-r3
https://github.com/CESNET/libyang/issues/773
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