CVE-2016-4356: Buffer Overflow
First published: Mon Jun 13 2016(Updated: )
The append_utf8_value function in the DN decoder (dn.c) in Libksba before 1.3.3 allows remote attackers to cause a denial of service (out-of-bounds read) by clearing the high bit of the byte after invalid utf-8 encoded data.
Credit: secalert@redhat.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| GnuPG Libksba | <=1.3.2 | |
| Ubuntu Linux | =12.04 | |
| Ubuntu Linux | =14.04 |
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Reference Links
- http://git.gnupg.org/cgi-bin/gitweb.cgi?p=libksba.git;a=commit;h=243d12fdec66a4360fbb3e307a046b39b5b4ffc3
- http://www.openwall.com/lists/oss-security/2016/04/29/5
- http://www.openwall.com/lists/oss-security/2016/04/29/8
- http://www.openwall.com/lists/oss-security/2016/05/10/3
- http://www.ubuntu.com/usn/USN-2982-1
- https://security.gentoo.org/glsa/201604-04
- http://git.gnupg.org/cgi-bin/gitweb.cgi?p=libksba.git%3Ba=commit%3Bh=243d12fdec66a4360fbb3e307a046b39b5b4ffc3
Frequently Asked Questions
What is the severity of CVE-2016-4356?
CVE-2016-4356 has a severity classification that indicates a denial of service vulnerability due to out-of-bounds read.
How do I fix CVE-2016-4356?
To fix CVE-2016-4356, upgrade to Libksba version 1.3.3 or later.
Which versions of Libksba are affected by CVE-2016-4356?
Libksba versions prior to 1.3.3 are affected by CVE-2016-4356.
What type of attack does CVE-2016-4356 enable?
CVE-2016-4356 enables attackers to perform a denial of service attack by causing an out-of-bounds read.
Is CVE-2016-4356 specific to certain operating systems?
Yes, CVE-2016-4356 impacts systems running affected versions of Libksba on Ubuntu 12.04 and 14.04.
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- vendor/gnupg
- canonical/gnupg libksba
- version/gnupg libksba/1.3.2
- vendor/canonical
- canonical/ubuntu linux
- version/ubuntu linux/12.04
- version/ubuntu linux/14.04