CVE-2017-9050 Out-of-bounds read in nokogiri
A heap-based buffer over-read in libxml2 allows attackers to cause a denial of service via crafted XML input, affecting applications like PHP.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2017-9050?
CVE-2017-9050 is a high-severity memory corruption vulnerability in Xmlsoft Libxml2, published on 18 May 2017. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
libxml2 20904-GITv2.9.4-16-g0741801 is vulnerable to a heap-based buffer over-read in the xmlDictAddString function in dict.c. This vulnerability causes programs that use libxml2, such as PHP, to crash. This vulnerability exists because of an incomplete fix for CVE-2016-1839.
Which versions are affected by CVE-2017-9050?
2 open source packages ship an affected version, including nokogiri. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
nokogiri RubyGems | All versions | 1.8.1 |
nokogiri RubyGems | All versions | 1.8.1 |
Products include Xmlsoft Libxml2.
How do I fix CVE-2017-9050?
Upgrade nokogiri to 1.8.1 or later.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2017-9050 being exploited?
There is no known exploitation of CVE-2017-9050 in the wild and no public exploit code.
Other vulnerabilities in Xmlsoft Libxml2
Sources
Also known as DEBIAN-CVE-2017-9050, ECHO-671f-1ea4-e79b, GHSA-8c56-cpmw-89x7, UBUNTU-CVE-2017-9050.