Title: Omron WorldView Wnn Asian Language Server Remote Buffer Overflow Vulnerability
Severity: CRITICAL
Description:
Omron WorldView Wnn is a software application designed to provide international language support for Unix systems. Wnn is a Kana-Kanji translation system, most commonly used for foreign language support.
A remote buffer overflow exists in the Asian language servers portion of a number of different implementations of Wnn. It has been reported that only systems that have WorldView Japanese, Korean, and Chinese installed are vulnerable to this issue. The servers are called /usr/bin/Wnn6/jserver, /usr/bin/kWnn4/kserver or /usr/bin/cWnn4/cserver.
The buffer overflow condition results when the language server receives a long string with a Wnn command, such as JS_OPEN, JS_MKDIR or JS_FILE_INFO, included.
This will cause the language server to improperly allocate space on the system stack. The language servers typically listen on port 22273 for communication. Thus, it is believed that an attacker could potentially exploit this condition to overwrite stack variables with malicious attacker-supplied values. It is highly possible that exploitation could result in execution of malicious attacker-supplied code as the [jkc]server process.
In typical installations, the language servers are executed with root privileges. An attacker, upon successful exploitation, is able to cause the server to execute malicious code with root privileges.
Affected Products:
- FreeWnn FreeWnn 1.0.0
- FreeWnn FreeWnn 1.1.0
- FreeWnn FreeWnn 1.1.1 -aXXX
- Omron WorldView 6.5.0
- SGI IRIX 6.5.0
- SGI IRIX 6.5.1
- SGI IRIX 6.5.10
- SGI IRIX 6.5.10 f
- SGI IRIX 6.5.10 m
- SGI IRIX 6.5.11
- SGI IRIX 6.5.11 f
- SGI IRIX 6.5.11 m
- SGI IRIX 6.5.12
- SGI IRIX 6.5.12 f
- SGI IRIX 6.5.12 m
- SGI IRIX 6.5.13
- SGI IRIX 6.5.13 f
- SGI IRIX 6.5.13 m
- SGI IRIX 6.5.14
- SGI IRIX 6.5.14 f
- SGI IRIX 6.5.14 m
- SGI IRIX 6.5.15
- SGI IRIX 6.5.15 f
- SGI IRIX 6.5.15 m
- SGI IRIX 6.5.2
- SGI IRIX 6.5.2 f
- SGI IRIX 6.5.2 m
- SGI IRIX 6.5.3
- SGI IRIX 6.5.3 f
- SGI IRIX 6.5.3 m
- SGI IRIX 6.5.4
- SGI IRIX 6.5.4 f
- SGI IRIX 6.5.4 m
- SGI IRIX 6.5.5
- SGI IRIX 6.5.5 f
- SGI IRIX 6.5.5 m
- SGI IRIX 6.5.6
- SGI IRIX 6.5.6 f
- SGI IRIX 6.5.6 m
- SGI IRIX 6.5.7
- SGI IRIX 6.5.7 f
- SGI IRIX 6.5.7 m
- SGI IRIX 6.5.8
- SGI IRIX 6.5.8 f
- SGI IRIX 6.5.8 m
- SGI IRIX 6.5.9
- SGI IRIX 6.5.9 f
- SGI IRIX 6.5.9 m
- Turbolinux Turbolinux 2.0.0
- Turbolinux Turbolinux 3.0.0
- Turbolinux Turbolinux 4.0.0
- Turbolinux Turbolinux 4.2.0
- Wnn Wnn4 4.2.0 -2TL
- Wnn Wnn4 4.2.0 -5TL
- Wnn Wnn4 4.2.0 -8
References:
- FreeWnn.org: freewnn
- Silicon Graphics Inc.: SGI Support
- TurboLinux: TurboLinux Support
- freewnn mailing list: security problem of jserver
- shadow penguin security: Wnn4.2/FreeWnn1.10/FreeWnn1.1.1a016-jserver remote overflow exploit
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