CVE-2019-20394: Double Free
First published: Wed Jan 22 2020(Updated: )
A double-free is present in libyang before v1.0-r3 in the function yyparse() when a type statement in used in a notification statement. 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.
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=1793932
- https://github.com/CESNET/libyang/commit/6cc51b1757dfbb7cff92de074ada65e8523289a6
- https://github.com/CESNET/libyang/compare/v1.0-r2...v1.0-r3
- https://github.com/CESNET/libyang/issues/769
- https://lists.debian.org/debian-lts-announce/2023/09/msg00019.html
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1797544
Frequently Asked Questions
What is the severity of CVE-2019-20394?
CVE-2019-20394 has a high severity due to the potential for crashes or code execution from a double-free vulnerability.
How do I fix CVE-2019-20394?
To fix CVE-2019-20394, update libyang to version 1.0-r3 or higher.
What versions of libyang are affected by CVE-2019-20394?
CVE-2019-20394 affects libyang versions before 1.0-r3, including specific versions 0.11-r1, 0.11-r2, 0.12-r1, 0.12-r2, 0.13-r1, 0.13-r2, 0.14-r1, 0.15-r1, 0.16-r1, 0.16-r2, and 0.16-r3.
What is the cause of CVE-2019-20394?
CVE-2019-20394 is caused by a double-free vulnerability in the yyparse() function when processing type statements in notification statements.
Can applications using libyang be exploited due to CVE-2019-20394?
Yes, applications that use libyang to parse untrusted input yang files may be vulnerable to exploitation due to CVE-2019-20394.
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- alias/CVE-2019-20394
- agent/software-canonical-lookup
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- agent/softwarecombine
- collector/nvd-index
- agent/software-canonical-lookup-request
- collector/nvd-api
- 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