medium
5.3
CWE
20
Advisory Published
Updated

CVE-2016-3739: Input Validation

First published: Fri May 20 2016(Updated: )

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.

Credit: secalert@redhat.com secalert@redhat.com

Affected SoftwareAffected VersionHow to fix
Curl=7.21.0
Curl=7.21.1
Curl=7.21.2
Curl=7.21.3
Curl=7.21.4
Curl=7.21.5
Curl=7.21.6
Curl=7.21.7
Curl=7.22.0
Curl=7.23.0
Curl=7.23.1
Curl=7.24.0
Curl=7.25.0
Curl=7.26.0
Curl=7.27.0
Curl=7.28.0
Curl=7.28.1
Curl=7.29.0
Curl=7.30.0
Curl=7.31.0
Curl=7.32.0
Curl=7.33.0
Curl=7.34.0
Curl=7.35.0
Curl=7.36.0
Curl=7.38.0
Curl=7.39.0
Curl=7.40.0
Curl=7.41.0
Curl=7.42.0
Curl=7.42.1
Curl=7.43.0
Curl=7.44.0
Curl=7.45.0
Curl=7.46.0
Curl=7.47.0
Curl=7.48.0

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Reference Links

Frequently Asked Questions

  • What is the severity of CVE-2016-3739?

    CVE-2016-3739 is classified as a high-severity vulnerability due to its potential to allow remote attackers to spoof servers.

  • How do I fix CVE-2016-3739?

    To fix CVE-2016-3739, update cURL and libcurl to version 7.49.0 or later.

  • What versions of cURL are affected by CVE-2016-3739?

    CVE-2016-3739 affects cURL and libcurl versions prior to 7.49.0, specifically versions 7.21.0 through 7.48.0.

  • What types of connections are impacted by CVE-2016-3739?

    CVE-2016-3739 affects SSLv3 connections and TLS connections to resources identified by numerical IP addresses.

  • What are the consequences of CVE-2016-3739?

    The consequences of CVE-2016-3739 include the potential for remote attackers to spoof servers, which could lead to data breaches or man-in-the-middle attacks.

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