CVE-2010-3870: Input Validation
First published: Fri Nov 12 2010(Updated: )
The utf8_decode function in PHP before 5.3.4 does not properly handle non-shortest form UTF-8 encoding and ill-formed subsequences in UTF-8 data, which makes it easier for remote attackers to bypass cross-site scripting (XSS) and SQL injection protection mechanisms via a crafted string.
Credit: secalert@redhat.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| PHP | <5.2.14 | |
| PHP | >=5.3.0<5.3.4 | |
| Ubuntu Linux | =6.06 | |
| Ubuntu Linux | =8.04 | |
| Ubuntu Linux | =9.10 | |
| Ubuntu Linux | =10.04 | |
| Ubuntu Linux | =10.10 | |
| Ubuntu | =10.10 | |
| Ubuntu | =9.10 | |
| Ubuntu | =8.04 | |
| Ubuntu | =10.04 | |
| Ubuntu | =6.06 |
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Reference Links
- http://bugs.php.net/bug.php?id=48230
- http://bugs.php.net/bug.php?id=49687
- http://lists.apple.com/archives/security-announce/2011/Mar/msg00006.html
- http://lists.fedoraproject.org/pipermail/package-announce/2011-January/052836.html
- http://lists.fedoraproject.org/pipermail/package-announce/2011-January/052845.html
- http://lists.opensuse.org/opensuse-security-announce/2010-12/msg00000.html
- http://marc.info/?l=bugtraq&m=133469208622507&w=2
- http://secunia.com/advisories/42410
- http://secunia.com/advisories/42812
- http://sirdarckcat.blogspot.com/2009/10/couple-of-unicode-issues-on-php-and.html
- http://support.apple.com/kb/HT4581
- http://svn.php.net/viewvc?view=revision&revision=304959
- http://us2.php.net/manual/en/function.utf8-decode.php#83935
- http://www.acunetix.com/blog/web-security-articles/security-risks-associated-with-utf8_decode/
- http://www.blackhat.com/presentations/bh-usa-09/VELANAVA/BHUSA09-VelaNava-FavoriteXSS-SLIDES.pdf
- http://www.mandriva.com/en/security/advisories?name=MDVSA-2010:224
- http://www.openwall.com/lists/oss-security/2010/11/02/1
- http://www.openwall.com/lists/oss-security/2010/11/02/11
- http://www.openwall.com/lists/oss-security/2010/11/02/2
- http://www.openwall.com/lists/oss-security/2010/11/02/4
- http://www.openwall.com/lists/oss-security/2010/11/02/6
- http://www.openwall.com/lists/oss-security/2010/11/02/8
- http://www.openwall.com/lists/oss-security/2010/11/03/1
- http://www.php.net/ChangeLog-5.php
- http://www.redhat.com/support/errata/RHSA-2010-0919.html
- http://www.redhat.com/support/errata/RHSA-2011-0195.html
- http://www.securityfocus.com/bid/44605
- http://www.securitytracker.com/id?1024797
- http://www.ubuntu.com/usn/USN-1042-1
- http://www.vupen.com/english/advisories/2010/3081
- http://www.vupen.com/english/advisories/2011/0020
- http://www.vupen.com/english/advisories/2011/0021
- http://www.vupen.com/english/advisories/2011/0077
Frequently Asked Questions
What is the severity of CVE-2010-3870?
CVE-2010-3870 is classified as a medium severity vulnerability due to its potential to allow attackers to bypass security mechanisms.
How do I fix CVE-2010-3870?
To fix CVE-2010-3870, upgrade PHP to version 5.3.4 or later, which addresses the issues with the utf8_decode function.
What systems are affected by CVE-2010-3870?
CVE-2010-3870 affects PHP versions prior to 5.3.4, as well as various Ubuntu Linux versions like 6.06 to 10.10.
What type of attacks can exploit CVE-2010-3870?
CVE-2010-3870 can be exploited through crafted strings that facilitate bypassing cross-site scripting (XSS) and SQL injection protections.
Is CVE-2010-3870 still a concern for modern applications?
While CVE-2010-3870 is an older vulnerability, legacy systems running the affected PHP versions may still be at risk.
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