An issue was discovered in International Components for Unicode (ICU) for C/C++ through 66.1. An integer overflow, leading to a heap-based buffer overflow, exists in the UnicodeString::doAppend() function in common/unistr.cpp.

References

• https://nvd.nist.gov/vuln/detail/CVE-2020-10531
• unicode-org/icu#971
• unicode-org/icu@b7d08bc
• https://access.redhat.com/errata/RHSA-2020:0738
• https://bugs.chromium.org/p/chromium/issues/detail?id=1044570
• https://chromereleases.googleblog.com/2020/02/stable-channel-update-for-desktop_24.html
• https://chromium.googlesource.com/chromium/deps/icu/+/9f4020916eb1f28f3666f018fdcbe6c9a37f0e08
• https://lists.debian.org/debian-lts-announce/2020/03/msg00024.html
• https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/4OOYAMJVLLCLXDTHW3V5UXNULZBBK4O6/
• https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/6IOHSO6BUKC6I66J5PZOMAGFVJ66ZS57/
• https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/X3B5RWJQD5LA45MYLLR55KZJOJ5NVZGP/
• https://security.gentoo.org/glsa/202003-15
• https://unicode-org.atlassian.net/browse/ICU-20958
• https://usn.ubuntu.com/4305-1/
• https://www.debian.org/security/2020/dsa-4646
• https://www.oracle.com//security-alerts/cpujul2021.html
• https://www.oracle.com/security-alerts/cpuapr2022.html
• https://www.oracle.com/security-alerts/cpujan2021.html
• http://lists.opensuse.org/opensuse-security-announce/2020-04/msg00004.html