CVE-2019-20398 : A NULL pointer dereference is present in libyang before v1.0-r3 in the function

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.

Published 2020-01-22 22:15:11

Updated 2023-09-19 22:15:11

Source MITRE

View at NVD, CVE.org

Vulnerability category: Memory Corruption

Products affected by CVE-2019-20398

Cesnet » Libyang » Version: 0.11 Update R1
cpe:2.3:a:cesnet:libyang:0.11:r1:*:*:*:*:*:*
Matching versions
Cesnet » Libyang » Version: 0.11 Update R2
cpe:2.3:a:cesnet:libyang:0.11:r2:*:*:*:*:*:*
Matching versions
Cesnet » Libyang » Version: 0.12 Update R1
cpe:2.3:a:cesnet:libyang:0.12:r1:*:*:*:*:*:*
Matching versions
Cesnet » Libyang » Version: 0.12 Update R2
cpe:2.3:a:cesnet:libyang:0.12:r2:*:*:*:*:*:*
Matching versions
Cesnet » Libyang » Version: 0.13 Update R1
cpe:2.3:a:cesnet:libyang:0.13:r1:*:*:*:*:*:*
Matching versions
Cesnet » Libyang » Version: 0.13 Update R2
cpe:2.3:a:cesnet:libyang:0.13:r2:*:*:*:*:*:*
Matching versions
Cesnet » Libyang » Version: 0.14 Update R1
cpe:2.3:a:cesnet:libyang:0.14:r1:*:*:*:*:*:*
Matching versions
Cesnet » Libyang » Version: 0.15 Update R1
cpe:2.3:a:cesnet:libyang:0.15:r1:*:*:*:*:*:*
Matching versions
Cesnet » Libyang » Version: 0.16 Update R1
cpe:2.3:a:cesnet:libyang:0.16:r1:*:*:*:*:*:*
Matching versions
Cesnet » Libyang » Version: 0.16 Update R2
cpe:2.3:a:cesnet:libyang:0.16:r2:*:*:*:*:*:*
Matching versions
Cesnet » Libyang » Version: 0.16 Update R3
cpe:2.3:a:cesnet:libyang:0.16:r3:*:*:*:*:*:*
Matching versions
Cesnet » Libyang » Version: 1.0 Update R1
cpe:2.3:a:cesnet:libyang:1.0:r1:*:*:*:*:*:*
Matching versions
Cesnet » Libyang » Version: 1.0 Update R2
cpe:2.3:a:cesnet:libyang:1.0:r2:*:*:*:*:*:*
Matching versions

Exploit prediction scoring system (EPSS) score for CVE-2019-20398

EPSS FAQ

0.12%

Probability of exploitation activity in the next 30 days EPSS Score History

~ 33 %

Percentile, the proportion of vulnerabilities that are scored at or less

CVSS scores for CVE-2019-20398

Base Score	Base Severity	CVSS Vector	Exploitability Score	Impact Score	Score Source
4.3	MEDIUM	AV:N/AC:M/Au:N/C:N/I:N/A:P	8.6	2.9	NIST
Access Vector: Network Access Complexity: Medium Authentication: None Confidentiality Impact: None Integrity Impact: None Availability Impact: Partial
6.5	MEDIUM	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H	2.8	3.6	NIST
Attack Vector: Network Attack Complexity: Low Privileges Required: None User Interaction: Required Scope: Unchanged Confidentiality: None Integrity: None Availability: High

CWE ids for CVE-2019-20398

CWE-476 NULL Pointer Dereference

The product dereferences a pointer that it expects to be valid but is NULL.

Assigned by: nvd@nist.gov (Primary)

References for CVE-2019-20398

https://github.com/CESNET/libyang/issues/773

Segmentation fault in yanglint and yangfuzz due to unprintable characters · Issue #773 · CESNET/libyang · GitHub
Exploit;Third Party Advisory
https://github.com/CESNET/libyang/compare/v1.0-r2...v1.0-r3

Comparing v1.0-r2...v1.0-r3 · CESNET/libyang · GitHub
Third Party Advisory

CVEs referencing this url
https://github.com/CESNET/libyang/commit/7852b272ef77f8098c35deea6c6f09cb78176f08

schema tree BUGFIX do not copy unresolved exts in groupings restrictions · CESNET/libyang@7852b27 · GitHub
Patch
https://bugzilla.redhat.com/show_bug.cgi?id=1793935

1793935 – libyang: NULL pointer dereference in function lys_extension_instances_free()
Issue Tracking;Patch;Third Party Advisory
https://lists.debian.org/debian-lts-announce/2023/09/msg00019.html

[SECURITY] [DLA 3572-1] libyang security update

CVEs referencing this url

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Vulnerability Details : CVE-2019-20398

Products affected by CVE-2019-20398

Exploit prediction scoring system (EPSS) score for CVE-2019-20398

CVSS scores for CVE-2019-20398

CWE ids for CVE-2019-20398

References for CVE-2019-20398