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UMN Gopher "VIfromLine()" and "FIOgetargv()" Buffer Overflows
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Secunia Advisory:
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SA16614
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Release Date:
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2005-08-30
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Last Update:
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2005-10-31
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Popularity:
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6,394 views
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Critical:
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Moderately critical
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Impact:
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System access
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Where:
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From remote
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Solution Status:
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Vendor Patch
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| Software: | UMN Gopher 2.x
UMN Gopher 3.x
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Subscribe:
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| CVE reference: | CVE-2005-2772
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Description:
vade79 has discovered two vulnerabilities in Gopher client, which can be exploited by malicious people to compromise a vulnerable system.
1) A boundary error in the "VIfromLine()" function when copying an input line to a stack buffer can be exploited to cause a stack-based buffer overflow via an overly long "+VIEWS:" reply from the server.
2) A boundary error in the "FIOgetargv()" function when processing arguments for launching external programs can be exploited to cause a stack-based buffer overflow via an overly long "hWeblink" reply from the server.
Successful exploitation requires that a user e.g. is tricked into connecting to a malicious Gopher server.
The vulnerabilities have been confirmed in version 3.0.9. Other versions may also be affected.
Solution:
Update to version 3.0.11.
http://quux.org/devel/gopher/Downloads
Provided and/or discovered by:
vade79
Changelog:
2005-09-02: Updated "Description" section with additional information.
2005-09-05: Added link to US-CERT vulnerability note.
2005-09-28: Added CVE reference.
2005-10-31: Updated "Solution" section.
Original Advisory:
http://www.fakehalo.us/xgopher-client.c
Other References:
US-CERT VU#619812:
http://www.kb.cert.org/vuls/id/619812
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Please note: The information that this Secunia Advisory is based on comes from a third party unless stated otherwise.
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