CVE-2007-4840: Input Validation
First published: Wed Sep 12 2007(Updated: )
PHP 5.2.4 and earlier allows context-dependent attackers to cause a denial of service (application crash) via (1) a long string in the out_charset parameter to the iconv function; or a long string in the charset parameter to the (2) iconv_mime_decode_headers, (3) iconv_mime_decode, or (4) iconv_strlen function. NOTE: this might not be a vulnerability in most web server environments that support multiple threads, unless these issues can be demonstrated for code execution.
Credit: cve@mitre.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| PHP | <=5.2.4 |
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Reference Links
- https://issues.rpath.com/browse/RPL-1943
- http://www.gentoo.org/security/en/glsa/glsa-200710-02.xml
- http://secunia.com/advisories/27102
- http://secunia.com/advisories/27659
- http://securityreason.com/securityalert/3122
- http://lists.opensuse.org/opensuse-security-announce/2008-01/msg00006.html
- http://secunia.com/advisories/28658
- http://secunia.com/advisories/30040
- http://wiki.rpath.com/wiki/Advisories:rPSA-2007-0242
- http://osvdb.org/38916
- http://www.securityfocus.com/archive/1/491693/100/0/threaded
- http://www.securityfocus.com/archive/1/478730/100/0/threaded
Frequently Asked Questions
What is the severity of CVE-2007-4840?
CVE-2007-4840 is rated as a moderate severity vulnerability that can lead to denial of service.
How do I fix CVE-2007-4840?
To fix CVE-2007-4840, upgrade PHP to a version later than 5.2.4.
What type of attack does CVE-2007-4840 facilitate?
CVE-2007-4840 can facilitate denial of service attacks through excessively long strings in certain parameters.
Which versions of PHP are affected by CVE-2007-4840?
CVE-2007-4840 affects PHP versions up to and including 5.2.4.
What functions are involved in the CVE-2007-4840 vulnerability?
The functions involved in CVE-2007-4840 include iconv, iconv_mime_decode_headers, and iconv_mime_decode.
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