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USN-4337-1: OpenJDK vulnerabilities

22 April 2020

Several security issues were fixed in OpenJDK.

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Details

It was discovered that OpenJDK incorrectly handled certain regular
expressions. An attacker could possibly use this issue to cause a denial of
service while processing a specially crafted regular expression.
(CVE-2020-2754, CVE-2020-2755)

It was discovered that OpenJDK incorrectly handled class descriptors and
catching exceptions during object stream deserialization. An attacker could
possibly use this issue to cause a denial of service while processing a
specially crafted serialized input. (CVE-2020-2756, CVE-2020-2757)

Bengt Jonsson, Juraj Somorovsky, Kostis Sagonas, Paul Fiterau Brostean and
Robert Merget discovered that OpenJDK incorrectly handled certificate messages
during TLS handshake. An attacker could possibly use this issue to bypass
certificate verification and insert, edit or obtain sensitive information. This
issue only affected OpenJDK 11. (CVE-2020-2767)

It was discovered that OpenJDK incorrectly handled exceptions thrown by
unmarshalKeyInfo() and unmarshalXMLSignature(). An attacker could possibly use
this issue to cause a denial of service while reading key info or XML signature
data from XML input. (CVE-2020-2773)

Peter Dettman discovered that OpenJDK incorrectly handled SSLParameters in
setAlgorithmConstraints(). An attacker could possibly use this issue to
override the defined systems security policy and lead to the use of weak
crypto algorithms that should be disabled. This issue only affected
OpenJDK 11. (CVE-2020-2778)

Simone Bordet discovered that OpenJDK incorrectly re-used single null TLS
sessions for new TLS connections. A remote attacker could possibly use this
issue to cause a denial of service. (CVE-2020-2781)

Dan Amodio discovered that OpenJDK did not restrict the use of CR and LF
characters in values for HTTP headers. An attacker could possibly use this
issue to insert, edit or obtain sensitive information. (CVE-2020-2800)

Nils Emmerich discovered that OpenJDK incorrectly checked boundaries or
argument types. An attacker could possibly use this issue to bypass sandbox
restrictions causing unspecified impact. (CVE-2020-2803, CVE-2020-2805)

It was discovered that OpenJDK incorrectly handled application data packets
during TLS handshake. An attacker could possibly use this issue to insert,
edit or obtain sensitive information. This issue only affected OpenJDK 11.
(CVE-2020-2816)

It was discovered that OpenJDK incorrectly handled certain regular
expressions. An attacker could possibly use this issue to cause a denial of
service. (CVE-2020-2830)

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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 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