| Package | Affected versions | Patched versions |
|---|---|---|
| http server | = 1.3.9 | |
| matt wright guestbook | = 2.3 |
guestbook.pl cleanses user-inserted SSI commands by removing text between "<!--" and "-->" separators, which allows remote attackers to execute arbitrary commands when guestbook.pl is run on Apache 1.3.9 and possibly other versions, since Apache allows other closing sequences besides "-->".
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