CVE-2016-4008 Denial of service in n/a

What is CVE-2016-4008?

CVE-2016-4008 is a medium-severity denial of service vulnerability in Canonical Ubuntu Linux, published on 5 May 2016. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

The _asn1_extract_der_octet function in lib/decoding.c in GNU Libtasn1 before 4.8, when used without the ASN1_DECODE_FLAG_STRICT_DER flag, allows remote attackers to cause a denial of service (infinite recursion) via a crafted certificate.

Weakness: CWE-399

Which versions are affected by CVE-2016-4008?

It affects 4 products.

Products include Canonical Ubuntu Linux, Fedoraproject Fedora, Gnu Libtasn1, Opensuse Opensuse.

How do I fix CVE-2016-4008?

Upgrade to a fixed version.

Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.

Is CVE-2016-4008 being exploited?

There is no known exploitation of CVE-2016-4008 in the wild and no public exploit code.

Other vulnerabilities in Canonical Ubuntu Linux

• CVE-2020-11651 SaltStack Salt Authentication Bypass Exploited Critical 9.8
• CVE-2020-7247 OpenSMTPD Remote Code Execution Exploited Critical 9.8
• CVE-2019-16928 Exim Out-of-bounds Write Exploited Critical 9.8
• CVE-2018-6789 Exim Buffer Overflow Exploited Critical 9.8
• CVE-2015-2590 Oracle Java SE and Java SE Embedded Remote Code Execution Exploited Critical 9.8

All Canonical Ubuntu Linux vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as DEBIAN-CVE-2016-4008, DLA-495-1, DSA-3568-1, GHSA-mr9j-58fj-gv7c, MGASA-2016-0170, UBUNTU-CVE-2016-4008 and 2 more.