A vulnerability in Oracle Java Runtime Environment (JRE) could allow an unauthenticated, remote attacker to execute arbitrary code on the system.
The vulnerability is due to insufficient validation of user-supplied input by the 2D sub-component of JRE while processing TTF files. An attacker could exploit this vulnerability by persuading a user to visit a crafted website that contains a malicious Java applet. Successful exploitation could allow the attacker to bypass sandbox protection and execute arbitrary code with the privileges of the user.
Oracle has confirmed the vulnerability and released software updates.
Indicators of Compromise
Following Oracle Java products are vulnerable:
JRE 7 Update 17 and prior
JRE 6 Update 43 and prior
JRE 5.0 Update 41 and prior
The vulnerability exits when the fontmanager native component performs insufficient bounds checks on GSUB tables in user-supplied a True Type Font (TTF) file.
An unauthenticated, remote attacker could exploit the vulnerability by convincing a targeted user to open a malicious TTF file with overly large Lookupcount sum parameter. Processing this parameter may trigger a memory corruption error and the attacker could leverage the memory corruption error to execute arbitrary code with elevated privileges.
To exploit the vulnerability, the attacker may provide a file to the user and may persuade the user to open the file using misleading language and instructions.
If the user holds elevated privileges, exploitation could result in complete compromise of the system.
Administrators are advised to apply the appropriate updates.
Users should verify that unsolicited links are safe to follow.
Users are advised not to visit websites or follow links that have suspicious characteristics or cannot be verified as safe.
Administrators are advised to monitor affected systems.
Red Hat Enterprise Linux Workstation Supplementary
6 (IA-32, x86_64)
5 (IA-32, IA-64, PPC, PPC64, S390, S390x, x86_64)
RHEL Supplementary EUS
5.9.z (IA-32, x86_64)
RHEL Supplementary Long Life
5.9 (IA-32, x86_64)
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Cisco Multivendor Vulnerability Alerts respond to vulnerabilities identified in third-party vendors' products. These alerts contain information compiled from diverse sources and provide comprehensive technical descriptions, objective analytical assessments, workarounds and practical safeguards, and links to vendor advisories and patches.