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Ruby Multiple Vulnerabilities
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Secunia Advisory:
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SA29794
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Release Date:
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2008-04-16
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Last Update:
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2008-06-23
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Critical:
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Highly critical
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Impact:
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Exposure of system information
Exposure of sensitive information
DoS
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: | Ruby 1.8.x
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| | CVE reference: | CVE-2008-1891 (Secunia mirror)
CVE-2008-2662 (Secunia mirror)
CVE-2008-2663 (Secunia mirror)
CVE-2008-2664 (Secunia mirror)
CVE-2008-2725 (Secunia mirror)
CVE-2008-2726 (Secunia mirror)
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Description:
Some vulnerabilities have been reported in Ruby, which can be exploited by malicious people to disclose sensitive information, cause a DoS (Denial of Service), or potentially compromise a vulnerable system.
1) Input passed via the URL to applications using "WEBrick::HTTPServlet::FileHandler" or "WEBrick::HTTPServer.new" with the ":DocumentRoot" option is not properly sanitised before being used. This can be exploited to disclose the content of files via a URL with certain characters appended (e.g. "+", "%2b", ".", "%2e", and "%20").
This is related to:
SA29232
Successful exploitation requires that a certain file system is used, e.g. NTFS or FAT32.
2) Multiple integer overflow errors exist within the "ary_new()", "rb_ary_initialize()", "rb_ary_store()", "rb_ary_times()", and "rb_ary_splice()" functions in array.c. These can potentially be exploited to cause buffer overflows via overly large arguments passed to the affected functions.
3) An error when allocating memory via an improper call to "alloca()" in "rb_str_buf_append()" can be exploited to corrupt memory.
Successful exploitation of the vulnerabilities may allow execution of arbitrary code.
The vulnerabilities are reported in the following versions:
* 1.8.4 and prior
* 1.8.5-p230 and prior
* 1.8.6-p229 and prior
* 1.8.7-p21 and prior
Do you have this product installed on your home computer? Scan using the free Personal Software Inspector. Check if a vulnerable version is installed on computers in your corporate network, scan using the Network Software Inspector.
Solution:
Update to a fixed version.
Ruby 1.8.5:
Update to 1.8.5-p231.
ftp://ftp.ruby-lang.org/pub/ruby/1.8/ruby-1.8.5-p231.tar.gz
md5sum: e900cf225d55414bffe878f00a85807c
Ruby 1.8.6:
Update to 1.8.6-p230.
ftp://ftp.ruby-lang.org/pub/ruby/1.8/ruby-1.8.6-p230.tar.gz
md5sum: 5e8247e39be2dc3c1a755579c340857f
Ruby 1.8.7:
Update to 1.8.7-p22.
ftp://ftp.ruby-lang.org/pub/ruby/1.8/ruby-1.8.7-p22.tar.gz
md5sum: fc3ede83a98f48d8cb6de2145f680ef2
Provided and/or discovered by:
1) Luigi Auriemma
2, 3) The vendor credits Drew Yao of Apple Product Security.
Changelog:
2008-04-22: Added CVE reference.
2008-06-23: Added vulnerabilities #2 and #3 to the advisory. Increased criticality. Updated the "Solution" and "Original Advisory" sections.
Original Advisory:
1) http://aluigi.altervista.org/adv/webrickcgi-adv.txt
2, 3) http://www.ruby-lang.org/en/news/2008...trary-code-execution-vulnerabilities/
Other References:
SA29232:
http://secunia.com/advisories/29232/
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Please note: The information that this Secunia Advisory is based on comes from a third party unless stated otherwise.
Secunia collects, validates, and verifies all vulnerability reports issued by security research groups, vendors, and others.
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8 Related Secunia Security Advisories
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1. Ruby "rb_ary_fill()" Denial of Service Vulnerability
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2. Ruby WEBrick Information Disclosure Vulnerabilities
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3. Ruby Modules Common Name Verification Security Issues
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4. Ruby Safe Level Security Bypass Vulnerabilities
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5. Ruby Safe-Level Security Bypass and Server Classes Denial of Service
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6. Ruby XMLRPC.iPIMethods Arbitrary Command Execution
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7. Ruby "cgi.rb" Denial of Service Vulnerability
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8. Ruby CGI Session Management Insecure File Creation Vulnerability
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