=========================================================== Ubuntu Security Notice USN-112-1 April 14, 2005 php4 vulnerabilities CAN-2005-1042, CAN-2005-1043 =========================================================== A security issue affects the following Ubuntu releases: Ubuntu 4.10 (Warty Warthog) The following packages are affected: libapache2-mod-php4 php4-cgi The problem can be corrected by upgrading the affected package to version 4:4.3.8-3ubuntu7.8. After performing a standard system upgrade you need to reload the PHP module in the webserver by executing sudo /etc/init.d/apache2 reload to effect the necessary changes. Details follow: An integer overflow was discovered in the exif_process_IFD_TAG() function in PHP4's EXIF module. EXIF tags with a specially crafted "Image File Directory" (IFD) tag caused a buffer overflow which could have been exploited to execute arbitrary code with the privileges of the PHP4 server. (CAN-2005-1042) The same module also contained a Denial of Service vulnerability. EXIF headers with a large IFD nesting level caused an unbound recursion which would eventually overflow the stack and cause the executed program to crash. (CAN-2005-1043) In web applications that automatically process EXIF tags of uploaded images, both vulnerabilities could be exploited remotely. 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