The remote Debian host is missing a security-related update.
Several vulnerabilities were discovered in the International Components for Unicode (ICU) library. - CVE-2014-8146 The Unicode Bidirectional Algorithm implementation 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. - CVE-2014-8147 The Unicode Bidirectional Algorithm implementation uses an integer data type that is inconsistent with a header file, which allows remote attackers to cause a denial of service (incorrect malloc followed by invalid free) or possibly execute arbitrary code via crafted text. - CVE-2015-4760 The Layout Engine was missing multiple boundary checks. These could lead to buffer overflows and memory corruption. A specially crafted file could cause an application using ICU to parse untrusted font files to crash and, possibly, execute arbitrary code. Additionally, it was discovered that the patch applied to ICU in DSA-3187-1 for CVE-2014-6585 was incomplete, possibly leading to an invalid memory access. This could allow remote attackers to disclose portion of private memory via crafted font files.
Upgrade the icu packages. For the oldstable distribution (wheezy), these problems have been fixed in version 126.96.36.199-12+deb7u3. For the stable distribution (jessie), these problems have been fixed in version 52.1-8+deb8u2.