medium
6.5
CWE
674
Advisory Published
Updated

CVE-2018-0739: Constructed ASN.1 types with a recursive definition could exceed the stack

First published: Tue Mar 27 2018(Updated: )

Constructed ASN.1 types with a recursive definition (such as can be found in PKCS7) could eventually exceed the stack given malicious input with excessive recursion. This could result in a Denial Of Service attack. There are no such structures used within SSL/TLS that come from untrusted sources so this is considered safe. Fixed in OpenSSL 1.1.0h (Affected 1.1.0-1.1.0g). Fixed in OpenSSL 1.0.2o (Affected 1.0.2b-1.0.2n).

Credit: openssl-security@openssl.org openssl-security@openssl.org

Affected SoftwareAffected VersionHow to fix
OpenSSL OpenSSL>=1.0.2b<=1.0.2n
OpenSSL OpenSSL>=1.1.0<=1.1.0g
Canonical Ubuntu Linux=14.04
Canonical Ubuntu Linux=16.04
Canonical Ubuntu Linux=17.10
Debian Debian Linux=7.0
Debian Debian Linux=8.0
Debian Debian Linux=9.0
redhat/openssl<1.1.0
1.1.0
redhat/openssl<1.0.2
1.0.2
IBM Security Verify Governance<=10.0
debian/libtomcrypt
1.18.2-5
1.18.2-6
1.18.2+dfsg-7
debian/openssl
1.1.1w-0+deb11u1
1.1.1n-0+deb11u5
3.0.14-1~deb12u1
3.0.14-1~deb12u2
3.3.2-1

Remedy

http://www.oracle.com/technetwork/security-advisory/cpuapr2018-3678067.html

Remedy

https://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=2ac4c6f7b2b2af20c0e2b0ba05367e454cd11b33

Remedy

https://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=9310d45087ae546e27e61ddf8f6367f29848220d

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Reference Links

Parent vulnerabilities

(Appears in the following advisories)

Frequently Asked Questions

  • What is CVE-2018-0739?

    CVE-2018-0739 is a vulnerability in OpenSSL that could result in a Denial of Service attack.

  • What is the severity of CVE-2018-0739?

    CVE-2018-0739 has a severity score of 6.5 (Medium).

  • Which software versions are affected by CVE-2018-0739?

    The OpenSSL versions 1.1.0 and 1.0.2 are affected by CVE-2018-0739.

  • How can I fix CVE-2018-0739?

    To fix CVE-2018-0739, you should update OpenSSL to version 1.0.2 or 1.1.0, as recommended by the vendor.

  • Where can I find more information about CVE-2018-0739?

    You can find more information about CVE-2018-0739 on the OpenSSL website and the provided references.

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