Stack-based buffer overflow in libyang - CVE-2019-19334
Published: December 23, 2019
Vulnerability identifier: #VU23798
CSH Severity: High
CVSS v4.0: 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/E:U/U:Amber
CVE-ID: CVE-2019-19334
CWE-ID: CWE-121
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: CESNET
Affected software:
libyang
libyang
Detailed vulnerability description
The vulnerability allows a remote attacker to execute arbitrary code on the target system.
The vulnerability exists due to a boundary error when libyang parses YANG files with a leaf of type "identityref". A remote unauthenticated attacker can pass to the application an untrusted YANG file, trigger stack-based buffer overflow and execute arbitrary code on the target system.
Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.
How to mitigate CVE-2019-19334
Install update from vendor's website.
Sources
- https://access.redhat.com/errata/RHSA-2019:4360
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-19334
- https://github.com/CESNET/libyang/commit/6980afae2ff9fcd6d67508b0a3f694d75fd059d6
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/PETB6TVMFV5KUD4IKVP2JPLBCYHUGSAJ/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/RL54JMS7XW7PI6JC4BFSNNLSX5AINQUL/