CVE-2013-1927: Medium severity red hat icedtea-web vulnerability
Current IcedTea-Web versions are affected by GIFAR issue. It is possible to combine GIF image with Java JAR into a single file, that is both valid GIF as well as valid JAR/ZIP file. This issue can be used to execute Java applet in the context of the site that allows untrusted users to upload images in GIF format.
This problem was previously fixed in Oracle and IBM Java plugins as CVE-2008-5343 (bug 474790).
References: http://en.wikipedia.org/wiki/Gifar http://xs-sniper.com/blog/2008/12/17/sun-fixes-gifars/ http://riosec.com/how-to-create-a-gifar
Other sources
The IcedTea-Web plugin before 1.2.3 and 1.3.x before 1.3.2 allows remote attackers to execute arbitrary code via a crafted file that validates as both a GIF and a Java JAR file, aka "GIFAR."
— MITRE
Affected Software
Event History
Frequently Asked Questions
What is the severity of CVE-2013-1927?
CVE-2013-1927 is classified as a high severity vulnerability that allows execution of arbitrary Java code through crafted GIF files.
How do I fix CVE-2013-1927?
To mitigate CVE-2013-1927, update IcedTea-Web to version 1.3.2 or later.
Which versions of IcedTea-Web are vulnerable to CVE-2013-1927?
IcedTea-Web versions prior to 1.3.2, including all versions from 1.0 to 1.2.3, are vulnerable to CVE-2013-1927.
Can I use CVE-2013-1927 in a trusted environment?
CVE-2013-1927 should not be used in trusted environments as it can allow unverified Java applets to execute malicious code.
Is there a workaround for CVE-2013-1927 if I cannot update?
If unable to update IcedTea-Web, restrict the upload of GIF files or treat them as untrusted content to minimize risks from CVE-2013-1927.