#VU22429 Heap-based buffer overflow in Libidn2
Vulnerability identifier: #VU22429
Vulnerability risk: High
CVSSv3.1: 7.7 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]
CVE-ID:
CWE-ID:
CWE-122
Exploitation vector: Network
Exploit availability: No
Vulnerable software:
Libidn2
Universal components / Libraries /
Libraries used by multiple products
Vendor: GNU
Description
The vulnerability allows a remote attacker to execute arbitrary code on the target system.
The vulnerability exists due to a boundary error within the idn2_to_ascii_4i() function in lib/lookup.c when processing domain names. A remote attacker can trick the victim to visit a specially crafted website, trigger heap-based buffer overflow and execute arbitrary code on the target system.
Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.
Mitigation
Install updates from vendor's website.
Vulnerable software versions
Libidn2: 2.0.1 - 2.1.0
External links
http://bugs.chromium.org/p/oss-fuzz/issues/detail?id=12420
http://github.com/libidn/libidn2/commit/e4d1558aa2c1c04a05066ee8600f37603890ba8c
http://github.com/libidn/libidn2/compare/libidn2-2.1.0...libidn2-2.1.1
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
