Description
The resolveImplicitLevels function in common/ubidi.c in the Unicode Bidirectional Algorithm implementation in ICU4C in International Components for Unicode (ICU) before 55.1 does not properly track directionally isolated pieces of text, which allows remote attackers to cause a denial of service (heap-based buffer overflow) or possibly execute arbitrary code via crafted text.
Metrics
CVSS 2.0 7.5/10
AV:N/AC:L/Au:N/C:P/I:P/A:PWeakness enumeration
Affected software
| Vendor | Product | Versions |
|---|---|---|
| n/a | n/a | n/a |
References
- http://bugs.icu-project.org/trac/changeset/37162Issue Tracking, Vendor Advisory
- http://lists.apple.com/archives/security-announce/2015/Sep/msg00001.htmlMailing List
- http://lists.apple.com/archives/security-announce/2015/Sep/msg00003.htmlMailing List
- http://lists.apple.com/archives/security-announce/2015/Sep/msg00005.htmlMailing List
- http://lists.apple.com/archives/security-announce/2015/Sep/msg00008.htmlMailing List
- http://openwall.com/lists/oss-security/2015/05/05/6Mailing List
- http://seclists.org/fulldisclosure/2015/May/14Exploit, Mailing List, Third Party Advisory
- http://www.debian.org/security/2015/dsa-3323Third Party Advisory
- http://www.kb.cert.org/vuls/id/602540Third Party Advisory, US Government Resource
- http://www.oracle.com/technetwork/topics/security/bulletinoct2015-2511968.htmlThird Party Advisory
- http://www.oracle.com/technetwork/topics/security/cpuoct2015-2367953.htmlPatch
- http://www.securityfocus.com/bid/74457Third Party Advisory, VDB Entry
- https://raw.githubusercontent.com/pedrib/PoC/master/generic/i-c-u-fail.txtExploit
- https://security.gentoo.org/glsa/201507-04Third Party Advisory
- https://support.apple.com/HT205212Third Party Advisory
- https://support.apple.com/HT205213Third Party Advisory
- https://support.apple.com/HT205221Third Party Advisory
- https://support.apple.com/HT205267Third Party Advisory
- https://www.oracle.com/technetwork/security-advisory/cpuapr2019-5072813.html
- http://bugs.icu-project.org/trac/changeset/37162Issue Tracking, Vendor Advisory
- http://lists.apple.com/archives/security-announce/2015/Sep/msg00001.htmlMailing List
- http://lists.apple.com/archives/security-announce/2015/Sep/msg00003.htmlMailing List
- http://lists.apple.com/archives/security-announce/2015/Sep/msg00005.htmlMailing List
- http://lists.apple.com/archives/security-announce/2015/Sep/msg00008.htmlMailing List
- http://openwall.com/lists/oss-security/2015/05/05/6Mailing List
- http://seclists.org/fulldisclosure/2015/May/14Exploit, Mailing List, Third Party Advisory
- http://www.debian.org/security/2015/dsa-3323Third Party Advisory
- http://www.kb.cert.org/vuls/id/602540Third Party Advisory, US Government Resource
- http://www.oracle.com/technetwork/topics/security/bulletinoct2015-2511968.htmlThird Party Advisory
- http://www.oracle.com/technetwork/topics/security/cpuoct2015-2367953.htmlPatch
- http://www.securityfocus.com/bid/74457Third Party Advisory, VDB Entry
- https://raw.githubusercontent.com/pedrib/PoC/master/generic/i-c-u-fail.txtExploit
- https://security.gentoo.org/glsa/201507-04Third Party Advisory
- https://support.apple.com/HT205212Third Party Advisory
- https://support.apple.com/HT205213Third Party Advisory
- https://support.apple.com/HT205221Third Party Advisory
- https://support.apple.com/HT205267Third Party Advisory
- https://www.oracle.com/technetwork/security-advisory/cpuapr2019-5072813.html
Timeline
- Published
- May 25, 2015
- Last modified
- Jun 17, 2026
- NVD status
- Modified