The Canna server, used for Japanese character input, has two security vulnerabilities including an exploitable buffer overflow that allows a local user to gain 'bin' user privileges. Updated packages for Red Hat Linux Advanced Server are available. [Updated 13 Jan 2003] Added fixed packages for the Itanium (IA64) architecture. [Updated 06 Feb 2003] Added fixed packages for Advanced Workstation 2.1
Canna is a kana-kanji conversion server which is necessary for Japanese language character input. A buffer overflow bug in the Canna server up to and including version 3.5b2 allows a local user to gain the privileges of the user 'bin' which can lead to further exploits. The Common Vulnerabilities and Exposures project (cve.mitre.org) has assigned the name CAN-2002-1158 to this issue. In addition, it was discovered that request validation was lacking in Canna server versions 3.6 and earlier. A malicious remote user could exploit this vulnerability to leak information or cause a denial of service attack. (CAN-2002-1159) Red Hat Linux Advanced Server ships with a Canna package vulnerable to these issues; however, the package is normally only installed when Japanese language support is selected during installation. All users of Canna are advised to upgrade to these errata packages which contain a backported security fix and are not vulnerable to this issue. Red Hat would like to thank hsj and AIDA Shinra for the responsible disclosure of these issues.