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Vulnerability of qmailAdmin, vpopmail: bypassing quotas

Synthesis of the vulnerability 

When the administrator defined quotas over 2Gb, they are not honoured by qmailAdmin and vpopmail.
Vulnerable systems: Unix (platform) ~ not comprehensive.
Severity of this threat: 1/4.
Creation date: 11/05/2009.
Références of this weakness: VIGILANCE-VUL-8702.

Description of the vulnerability 

The vpopmail program is used to create virtual mailboxes. The qmailAdmin program is used to manage a qmail or vpopmail messaging system.

The administrator can define a quota in qmailAdmin and vpopmail in order to limit the size of users' mailboxes.

However, these quotas are stored in a signed 32 bit integer. The maximal value is thus 2^31-1 = 2147483647 = 2Go. If the administrator defined a superior value, it is not honoured. The mailbox size is therefore not limited.

When the administrator defined quotas over 2Gb, they are thus not honoured by qmailAdmin and vpopmail.
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This computer vulnerability announce impacts software or systems such as Unix (platform) ~ not comprehensive.

Our Vigil@nce team determined that the severity of this cybersecurity bulletin is low.

The trust level is of type unique source, with an origin of user account.

An attacker with a expert ability can exploit this threat alert.

Solutions for this threat 

qmailAdmin, vpopmail: workaround for quotas.
A workaround is to not define quotas over 2Gb.
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