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USN-4223-1: OpenJDK vulnerabilities

17 December 2019

Several security issues were fixed in OpenJDK.

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Details

Jan Jancar, Petr Svenda, and Vladimir Sedlacek discovered that a side-
channel vulnerability existed in the ECDSA implementation in OpenJDK. An
Attacker could use this to expose sensitive information. (CVE-2019-2894)

It was discovered that the Socket implementation in OpenJDK did not
properly restrict the creation of subclasses with a custom Socket
implementation. An attacker could use this to specially create a Java class
that could possibly bypass Java sandbox restrictions. (CVE-2019-2945)

Rob Hamm discovered that the Kerberos implementation in OpenJDK did not
properly handle proxy credentials. An attacker could possibly use this to
impersonate another user. (CVE-2019-2949)

It was discovered that a NULL pointer dereference existed in the font
handling implementation in OpenJDK. An attacker could use this to cause a
denial of service (application crash). (CVE-2019-2962)

It was discovered that the Concurrency subsystem in OpenJDK did not
properly bound stack consumption when compiling regular expressions. An
attacker could use this to cause a denial of service (application crash).
(CVE-2019-2964)

It was discovered that the JAXP subsystem in OpenJDK did not properly
handle XPath expressions in some situations. An attacker could use this to
cause a denial of service (application crash). (CVE-2019-2973,
CVE-2019-2981)

It was discovered that the Nashorn JavaScript subcomponent in OpenJDK did
not properly handle regular expressions in some situations. An attacker
could use this to cause a denial of service (application crash).
(CVE-2019-2975)

It was discovered that the String class in OpenJDK contained an out-of-
bounds access vulnerability. An attacker could use this to cause a denial
of service (application crash) or possibly expose sensitive information.
This issue only affected OpenJDK 11 in Ubuntu 18.04 LTS, Ubuntu 19.04,
and Ubuntu 19.10. (CVE-2019-2977)

It was discovered that the Jar URL handler in OpenJDK did not properly
handled nested Jar URLs in some situations. An attacker could use this to
cause a denial of service (application crash). (CVE-2019-2978)

It was discovered that the Serialization component of OpenJDK did not
properly handle deserialization of certain object attributes. An attacker
could use this to cause a denial of service (application crash).
(CVE-2019-2983)

It was discovered that the FreetypeFontScaler class in OpenJDK did not
properly validate dimensions of glyph bitmap images read from font files.
An attacker could specially craft a font file that could cause a denial of
service (application crash). (CVE-2019-2987)

It was discovered that a buffer overflow existed in the SunGraphics2D class
in OpenJDK. An attacker could possibly use this to cause a denial of
service (excessive memory consumption or application crash).
(CVE-2019-2988)

It was discovered that the Networking component in OpenJDK did not properly
handle certain responses from HTTP proxies. An attacker controlling a
malicious HTTP proxy could possibly use this to inject content into a
proxied HTTP connection. (CVE-2019-2989)

It was discovered that the font handling implementation in OpenJDK did not
properly validate TrueType font files in some situations. An attacker could
specially craft a font file that could cause a denial of service (excessive
memory consumption). (CVE-2019-2992)

It was discovered that the JavaDoc generator in OpenJDK did not properly
filter out some HTML elements properly, including documentation comments in
Java source code. An attacker could possibly use this to craft a Cross-Site
Scripting attack. (CVE-2019-2999)

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Ubuntu Pro provides ten-year security coverage to 25,000+ packages in Main and Universe repositories, and it is free for up to five machines.

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Update instructions

The problem can be corrected by updating your system to the following package versions:

Ubuntu 19.10
Ubuntu 19.04
Ubuntu 18.04
Ubuntu 16.04

This update uses a new upstream release, which includes additional bug
fixes. After a standard system update you need to restart any Java
applications or applets to make all the necessary changes.

References

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Further reading