CyberSecBulletin
CVE-2013-2423Exploited in the wildNVD status: Analyzed

Oracle JRE Unspecified

Published Updated By the CyberSecBulletin desk

CVE-2013-2423 is a medium-severity improper access control vulnerability in JRE from Oracle, with a CVSS 2.0 base score of 4.3 out of 10. It can be exploited remotely over the network by an unauthenticated attacker, without any action from a user. Affected JRE versions: 1.7.0. The record does not name a fixed version, so check the vendor advisory. CISA added it to the Known Exploited Vulnerabilities catalogue on May 25, 2022, which means attacks have been observed in the wild.

Patch now

Attackers are already exploiting this vulnerability, according to CISA.

What to do

  1. Check which version of JRE you run against the affected versions below, and install the vendor's latest release.
  2. CISA's required action: Apply updates per vendor instructions.
  3. Read the advisory on oracle.com for workarounds and exact fixed builds.
  4. Until you can update, restrict network access to the affected service so it is not reachable from untrusted networks.

Affected products and versions

VendorProductAffected versionsFixed in
OracleJRE1.7.0Not stated
CanonicalUbuntu Linux12.10Not stated
openSUSEOpensuse12.3Not stated

Version data comes from NVD's product matching. Confirm against the vendor advisory before deciding you are unaffected.

How the severity score breaks down

Access vector
NetworkCan be exploited remotely over a network.
Access complexity
MediumSome conditions must be met.
Authentication
NoneNo login is needed.
Confidentiality
NoneNo data is disclosed.
Integrity
PartialSome data can be modified.
Availability
NoneAvailability is not affected.

Vector: AV:N/AC:M/Au:N/C:N/I:P/A:N. Scored by NVD.

Scoring systemScoreSeverityScored by
CVSS 3.13.7LowCISA (ADP)
CVSS 2.04.3MediumNVD

Official description

Unspecified vulnerability in the Java Runtime Environment (JRE) component in Oracle Java SE 7 Update 17 and earlier, and OpenJDK 7, allows remote attackers to affect integrity via unknown vectors related to HotSpot. NOTE: the previous information is from the April 2013 CPU. Oracle has not commented on claims from the original researcher that this vulnerability allows remote attackers to bypass permission checks by the MethodHandles method and modify arbitrary public final fields using reflection and type confusion, as demonstrated using integer and double fields to disable the security manager.

Source: the CVE record as published by its numbering authority, via NVD and CVE.org.

The underlying weakness: Improper Access Control

The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor.

How developers prevent this class of flaw

  • Very carefully manage the setting, management, and handling of privileges. Explicitly manage trust zones in the software.
  • Compartmentalize the system to have safe areas where trust boundaries can be unambiguously drawn. Do not allow sensitive data to go outside of the trust boundary and always be careful when interfacing with a compartment outside of the safe area. Ensure that appropriate compartmentalization is built into the system design, and the compartmentalization allows for and reinforces privilege separation functionality. Architects and designers should rely on the principle of least privilege to decide the appropriate time to use privileges and the time to drop privileges.

More Improper Access Control vulnerabilities (CWE-284)

Timeline

  1. CVE record published.
  2. Added to CISA's Known Exploited Vulnerabilities catalogue.
  3. Deadline for US federal agencies to remediate, set by CISA.
  4. CISA published its SSVC assessment (exploitation: active, automatable: no, technical impact: partial).
  5. Record last changed materially (score, affected products, status or references).

References

Other vulnerabilities in JRE

All JRE vulnerabilities

Recent Improper Access Control vulnerabilities

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