CVE-2016-3739 Security feature bypass in n/a
Attackers can spoof servers using valid certificates when cURL connects to IP addresses via SSLv3 or TLS, bypassing certificate validation.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2016-3739?
CVE-2016-3739 is a medium-severity vulnerability in Haxx Curl, published on 20 May 2016. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
The (1) mbed_connect_step1 function in lib/vtls/mbedtls.c and (2) polarssl_connect_step1 function in lib/vtls/polarssl.c in cURL and libcurl before 7.49.0, when using SSLv3 or making a TLS connection to a URL that uses a numerical IP address, allow remote attackers to spoof servers via an arbitrary valid certificate.
Weakness: CWE-20
Which versions are affected by CVE-2016-3739?
It affects 1 product.
Products include Haxx Curl.
How do I fix CVE-2016-3739?
Upgrade to a fixed version.
Is CVE-2016-3739 being exploited?
There is no known exploitation of CVE-2016-3739 in the wild and no public exploit code.
Other vulnerabilities in Haxx Curl
Sources
Also known as CURL-CVE-2016-3739, DEBIAN-CVE-2016-3739, GHSA-4rcg-2r46-4hcc.