CVE-2019-20398: Null Pointer Dereference
First published: Wed Jan 22 2020(Updated: )
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.
Credit: cve@mitre.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| redhat/libyang | <1.0 | 1.0 |
| CESNET | =0.11-r1 | |
| CESNET | =0.11-r2 | |
| CESNET | =0.12-r1 | |
| CESNET | =0.12-r2 | |
| CESNET | =0.13-r1 | |
| CESNET | =0.13-r2 | |
| CESNET | =0.14-r1 | |
| CESNET | =0.15-r1 | |
| CESNET | =0.16-r1 | |
| CESNET | =0.16-r2 | |
| CESNET | =0.16-r3 | |
| CESNET | =1.0-r1 | |
| CESNET | =1.0-r2 |
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Reference Links
- 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
- https://lists.debian.org/debian-lts-announce/2023/09/msg00019.html
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1797552
Frequently Asked Questions
What is the severity of CVE-2019-20398?
CVE-2019-20398 is classified as a high severity vulnerability due to the potential for application crashes from a NULL pointer dereference.
How do I fix CVE-2019-20398?
To fix CVE-2019-20398, you should upgrade libyang to version 1.0-r3 or later.
Which versions of libyang are affected by CVE-2019-20398?
CVE-2019-20398 affects libyang versions prior to v1.0-r3, including versions up to and including 1.0.
What type of issue is identified in CVE-2019-20398?
CVE-2019-20398 is a NULL pointer dereference issue that can lead to application crashes when parsing untrusted YANG files.
Can I use older versions of libyang without addressing CVE-2019-20398?
Using older versions of libyang without addressing CVE-2019-20398 is risky, as they are vulnerable to crashes when processing untrusted input.
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- package-manager/redhat
- vendor/cesnet
- canonical/cesnet
- version/cesnet/0.11-r1
- version/cesnet/0.11-r2
- version/cesnet/0.12-r1
- version/cesnet/0.12-r2
- version/cesnet/0.13-r1
- version/cesnet/0.13-r2
- version/cesnet/0.14-r1
- version/cesnet/0.15-r1
- version/cesnet/0.16-r1
- version/cesnet/0.16-r2
- version/cesnet/0.16-r3
- version/cesnet/1.0-r1
- version/cesnet/1.0-r2