CVE-2019-19334: cesnet libyang Stack-based Buffer Overflow

Vulnerability summary

CVE-2019-19334 is a critical (CVSS 9.8) Stack-based Buffer Overflow vulnerability in cesnet libyang. EPSS estimates a 3.87% chance of exploitation in the next 30 days, higher than 90% of scored vulnerabilities.

Timeline

1. 06-12-2019
   PublishedVulnerability first disclosed.
2. 05-08-2024
   Last modifiedVulnerability information updated.

Description

In all versions of libyang before 1.0-r5, a stack-based buffer overflow was discovered in the way libyang parses YANG files with a leaf of type "identityref". An application that uses libyang to parse untrusted YANG files may be vulnerable to this flaw, which would allow an attacker to cause a denial of service or possibly gain code execution.

• CWE-121Stack-based Buffer OverflowA stack-based buffer overflow condition is a condition where the buffer being overwritten is allocated on the stack (i.e., is a local variable or, rarely, a parameter to a function).
• CWE-787Out-of-bounds WriteThe product writes data past the end, or before the beginning, of the intended buffer.