Title: Salim Gasmi GLD Postfix Greylisting Daemon Buffer Overflow Vulnerability
Severity: CRITICAL
Description:
Salim Gasmi's GLD Postfix greylisting daemon is a standalone daemon designed to implement the greylisting protocol as described at http://www.greylisting.org.
It is reported that GLD contains a buffer overflow vulnerability. This issue is due to a failure of the application to properly ensure that a fixed-sise memory buffer is sufficiently large prior to copying user-supplied input data into it.
Specifically, in the 'server.c' file, in the 'HandleChild()' function, there is a fixed-size buffer of 2048 bytes called 'buff'. In a 'sprintf()' function call, the 'buff' buffer is filled with user-supplied input data, allowing remote attackers to overflow the destination buffer.
Remote attackers may exploit this vulnerability to cause arbitrary machine code to be executed in the context of the affected service. As the service is designed to be run as the superuser, remote attackers may gain superuser privileges on affected computers.
GLD version 1.4 is reportedly affected, but prior versions may also be affected.
Affected Products:
- Gentoo Linux
- Salim Gasmi GLD 1.0.0
- Salim Gasmi GLD 1.1.0
- Salim Gasmi GLD 1.2.0
- Salim Gasmi GLD 1.3.0
- Salim Gasmi GLD 1.3.1
- Salim Gasmi GLD 1.4.0
References:
- Salim Gasmi: GLD Home Page
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