ClamAV before 0.91.2, as used in Kolab Server 2.0 through 2.2beta1 and other products, allows remote attackers to cause a denial of service (application crash) via (1) a crafted RTF file, which triggers a NULL dereference in the cli_scanrtf function in libclamav/rtf.c; or (2) a crafted HTML document with a data: URI, which triggers a NULL dereference in the cli_html_normalise function in libclamav/htmlnorm.c. NOTE: some of these details are obtained from third party information.
https://wwws.clamav.net/bugzilla/show_bug.cgi?id=611
https://wwws.clamav.net/bugzilla/show_bug.cgi?id=582
https://www.redhat.com/archives/fedora-package-announce/2007-September/msg00104.html
https://exchange.xforce.ibmcloud.com/vulnerabilities/36177
https://exchange.xforce.ibmcloud.com/vulnerabilities/36173
http://www.vupen.com/english/advisories/2008/0924/references
http://www.vupen.com/english/advisories/2007/2952
http://www.trustix.org/errata/2007/0026/
http://www.securityfocus.com/bid/25398
http://www.novell.com/linux/security/advisories/2007_18_sr.html
http://www.mandriva.com/security/advisories?name=MDKSA-2007:172
http://www.debian.org/security/2007/dsa-1366
http://sourceforge.net/project/shownotes.php?release_id=533658
http://securityreason.com/securityalert/3054
http://security.gentoo.org/glsa/glsa-200709-14.xml
http://secunia.com/advisories/29420
http://secunia.com/advisories/26916
http://secunia.com/advisories/26822
http://secunia.com/advisories/26751
http://secunia.com/advisories/26683
http://secunia.com/advisories/26674
http://secunia.com/advisories/26654
http://secunia.com/advisories/26552
http://secunia.com/advisories/26530
http://lists.apple.com/archives/security-announce/2008/Mar/msg00001.html