Heap-Based Buffer Overflow in GNU libidn2 Affects Multiple Linux Distributions
CVE-2019-18224

9.8CRITICAL

Key Information:

Vendor
Gnu
Status
Libidn2
Vendor
CVE Published:
21 October 2019

Summary

The GNU libidn2 library before version 2.1.1 is susceptible to a heap-based buffer overflow due to improper handling of excessively long domain strings in the idn2_to_ascii_4i function within lib/lookup.c. This flaw can lead to unexpected behavior, including potential crashes or execution of arbitrary code, making it essential for users of this library to upgrade to the latest version to remedy the vulnerability and secure their environments.

References

https://github.com/libidn/libidn2/compare/libidn2-2.1.0.....
x_refsource_MISC
https://github.com/libidn/libidn2/commit/e4d1558aa2c1c04a...
x_refsource_MISC
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=12420
x_refsource_MISC

CVSS V3.1

Score:
9.8
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.