Hello,
during investigation of Sober.l we got the idea to replace the spaces of a filename contained in the ZIP archive by some escape sequences.
Many AV software is logging such filenames during decompressing, so after creating such regular ZIP archive (by using Perl Archive::Zip module, no other tweaks!) we've found that some of the tested products do not filter or replace the escape sequences, which leads to funny results during displaying the output of the AV scanner or viewing the log.
Also we found that at least 2 AV scan programs from 2 vendors do not detect the virus inside and report "clean" instead.
See here for more details:
<ftp://ftp.aerasec.de/pub/advisories/unfiltered-escape-sequences/unfiltered-escape-sequences.txt> <http://www.aerasec.de/security/index.html?id=ae-200503-020&lang=en>
We provide also samples and the Perl program for creating the samples: <ftp://ftp.aerasec.de/pub/advisories/unfiltered-escape-sequences/>
Due lack of time we only tested a few products, so if one can provide results of other products, pls. send them (also) to us. Thank you!
Regards, Dr. Peter Bieringer -- Dr. Peter Bieringer Phone: +49-8102-895190 AERAsec Network Services and Security GmbH Fax: +49-8102-895199 Wagenberger Strasse 1 Mobile: +49-174-9015046 D-85662 Hohenbrunn E-Mail: pbieringer@xxxxxxxxxx Germany Internet: http://www.aerasec.de
Attachment:
pgpLyWURmsWmz.pgp
Description: PGP signature
