CVE-2016-1000338 In Bouncy Castle JCE Provider it is possible to inject extra elements in the sequence making up the signature and still have it validate
Attackers can inject invisible data into signed structures by exploiting insufficient ASN.1 validation in DSA signatures, compromising data integrity.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2016-1000338?
CVE-2016-1000338 is a high-severity vulnerability in Canonical Ubuntu Linux, published on 1 Jun 2018. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
In Bouncy Castle JCE Provider version 1.55 and earlier the DSA does not fully validate ASN.1 encoding of signature on verification. It is possible to inject extra elements in the sequence making up the signature and still have it validate, which in some cases may allow the introduction of 'invisible' data into a signed structure.
Weakness: CWE-347
Which versions are affected by CVE-2016-1000338?
6 open source packages ship an affected version, including org.bouncycastle:bcprov-jdk14, org.bouncycastle:bcprov-jdk15 and org.bouncycastle:bcprov-jdk15on. It affects 5 products.
| Package | Affected | Fixed in |
|---|---|---|
org.bouncycastle:bcprov-jdk14 Maven | From 1.38 | 1.56 |
org.bouncycastle:bcprov-jdk14 Maven | From 1.38 | 1.56 |
org.bouncycastle:bcprov-jdk15 Maven | From 1.38 | 1.56 |
org.bouncycastle:bcprov-jdk15 Maven | From 1.38 | 1.56 |
org.bouncycastle:bcprov-jdk15on Maven | From 1.38 | 1.56 |
org.bouncycastle:bcprov-jdk15on Maven | From 1.38 | 1.56 |
Products include Bouncycastle Legion-of-the-Bouncy-Castle-Java-Crytography-Api, Canonical Ubuntu Linux, Netapp 7-Mode Transition Tool, Redhat Satellite, Redhat Satellite Capsule.
How do I fix CVE-2016-1000338?
Upgrade org.bouncycastle:bcprov-jdk14 to 1.56 or later.
Is CVE-2016-1000338 being exploited?
There is no known exploitation of CVE-2016-1000338 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2016-1000338, GHSA-4vhj-98r6-424h, UBUNTU-CVE-2016-1000338.