CVE-2017-17484

moderate-risk
Published 2017-12-10

The ucnv_UTF8FromUTF8 function in ucnv_u8.cpp in International Components for Unicode (ICU) for C/C++ through 60.1 mishandles ucnv_convertEx calls for UTF-8 to UTF-8 conversion, which allows remote attackers to cause a denial of service (stack-based buffer overflow and application crash) or possibly have unspecified other impact via a crafted string, as demonstrated by ZNC.

Do I need to act?

~
4.5% chance of exploitation in next 30 days
EPSS score — moderate exploit probability
-
Not on CISA KEV list
No confirmed active exploitation reported to CISA
?
Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
9
CVSS 9.8/10 Critical
NETWORK / LOW complexity

Affected Products (1)

International Components For Unicode

Affected Vendors

Icu-Project

References (14)

Issue Tracking https://github.com/znc/znc/issues/1459
Exploit https://ssl.icu-project.org/trac/attachment/ticket/13490/poc.cpp
Issue Tracking https://ssl.icu-project.org/trac/changeset/40714
Issue Tracking https://ssl.icu-project.org/trac/changeset/40715
Issue Tracking https://ssl.icu-project.org/trac/ticket/13490
Issue Tracking https://ssl.icu-project.org/trac/ticket/13510
https://www.oracle.com/technetwork/security-advisory/cpuapr2019-5072813.html
Issue Tracking https://github.com/znc/znc/issues/1459
Exploit https://ssl.icu-project.org/trac/attachment/ticket/13490/poc.cpp
Issue Tracking https://ssl.icu-project.org/trac/changeset/40714
Issue Tracking https://ssl.icu-project.org/trac/changeset/40715
Issue Tracking https://ssl.icu-project.org/trac/ticket/13490
Issue Tracking https://ssl.icu-project.org/trac/ticket/13510
https://www.oracle.com/technetwork/security-advisory/cpuapr2019-5072813.html
45
/ 100
moderate-risk
Severity 32/34 · Critical
Exploitability 8/34 · Low
Exposure 5/34 · Minimal