CVE-2020-2756 Deserialization in Java
An unauthenticated attacker can cause a partial denial of service in Java SE via a difficult-to-exploit deserialization vulnerability.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2020-2756?
CVE-2020-2756 is a low-severity unsafe deserialization vulnerability in Canonical Ubuntu Linux, published on 15 Apr 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Vulnerability in the Java SE, Java SE Embedded product of Oracle Java SE (component: Serialization). Supported versions that are affected are Java SE: 7u251, 8u241, 11.0.6 and 14; Java SE Embedded: 8u241. Difficult to exploit vulnerability allows unauthenticated attacker with network access via multiple protocols to compromise Java SE, Java SE Embedded. Successful attacks of this vulnerability can result in unauthorized ability to cause a partial denial of service (partial DOS) of Java SE, Java SE Embedded. Note: Applies to client and server deployment of Java. This vulnerability can be exploited through sandboxed Java Web Start applications and sandboxed Java applets. It can also be exploited by supplying data to APIs in the specified Component without using sandboxed Java Web Start applications or sandboxed Java applets, such as through a web service. CVSS 3.0 Base Score 3.7 (Availability impacts). CVSS Vector: (CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L).
Which versions are affected by CVE-2020-2756?
3 open source packages ship an affected version, including java, java-min and jre. It affects 20 products.
| Package | Affected | Fixed in |
|---|---|---|
java Bitnami | All versions | 1.7.0, 1.8.0, 7.0.261, 8.0.251, 11.0.7, 14.0.1 |
java-min Bitnami | All versions | 1.7.0, 1.8.0, 7.0.261, 8.0.251, 11.0.7, 14.0.1 |
jre Bitnami | All versions | 1.7.0, 1.8.0, 7.0.261, 8.0.251, 11.0.7, 14.0.1 |
Products include Canonical Ubuntu Linux, Debian Debian Linux, Fedoraproject Fedora, Mcafee Epolicy Orchestrator, Netapp 7-Mode Transition Tool, Netapp Active Iq Unified Manager and 14 more.
How do I fix CVE-2020-2756?
Upgrade java to a fixed version for your release line: 1.7.0, 1.8.0, 7.0.261 or 8.0.251.
Upgrade, and only deserialise data from trusted sources or with an allow-list of types. More about Unsafe deserialization.
Is CVE-2020-2756 being exploited?
There is no known exploitation of CVE-2020-2756 in the wild and no public exploit code.
Other vulnerabilities in Canonical Ubuntu Linux
Sources
Also known as BIT-java-2020-2756, BIT-java-min-2020-2756, BIT-jre-2020-2756, CLEANSTART-2026-KT74451, CLEANSTART-2026-RB86939, DEBIAN-CVE-2020-2756 and 7 more.