Some vulnerabilities have been reported in ClamAV, which can potentially be exploited by malicious people to cause a DoS (Denial of Service) or to compromise a vulnerable system.
1) A NULL-pointer dereference error exists within the "cli_scanrtf()" function in libclamav/rtf.c. This can potentially be exploited to crash ClamAV via a specially crafted RTF file.
2) A NULL-pointer dereference error exists within the "cli_html_normalise()" function in libclamav/htmlnorm.c. This can potentially be exploited to crash ClamAV via a specially crafted HTML file containing a "data" URL scheme.
3) The recipient address extracted from email messages is not properly sanitised before being used in a call to "popen()" when executing sendmail. This can be exploited to execute arbitrary code with the privileges of the clamav-milter process by sending an email with a specially crafted recipient address to the affected system.
Successful exploitation requires that clamav-milter is started with the "black hole" mode activated.
The vulnerabilities are reported in versions prior to 0.91.2.
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Subject: ClamAV Multiple Vulnerabilities
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