HTTP: Yabb Directory Traversal
This signature detects attempts to exploit a known vulnerability in the YaBB.pl CGI script. Attackers can view arbitrary files.
Extended Description
YaBB.pl, a web-based bulletin board script, stores board postings in numbered text files. The numbered file name is specified in the call to YaBB.pl in the variable num=. Before retrieving the file, YaBB will append a .txt extension to . Due to input validation problems in YaBB, relative paths can be specified in . This includes ../ style paths. Additionally, does not need to be numerical, and the .txt extension can be avoided by appending %00 to . By exploiting these problems in a single request, a malicious user can view any file that the webserver has access to.
Affected Products
Yabb yabb
Short Name
HTTP:CGI:YABB-DIR-TRAVERSAL
Severity
Minor
Recommended
False
Recommended Action
None
Category
HTTP
Keywords
CVE-2000-0853 Directory Traversal Yabb bid:1668
Release Date
04/22/2003
Supported Platforms
srx-branch-12.3
srx-19.3
srx-branch-19.3
vsrx3bsd-19.2
srx-branch-19.4
vsrx-19.4
mx-12.3
mx-19.4
vmx-19.4
mx-19.3
vsrx3bsd-19.4
srx-19.4
vsrx-12.3
vmx-19.3
vsrx-19.2
srx-12.3
Sigpack Version
3336
False Positive
Unknown
Vendors
Yabb
CVSS Score
5.0