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Sid 1-40038

Message

SERVER-WEBAPP PHP unserialize var_hash use-after-free attempt

Summary

ext/session/session.c in PHP before 5.5.38, 5.6.x before 5.6.24, and 7.x before 7.0.9 does not properly maintain a certain hash data structure, which allows remote attackers to cause a denial of service (use-after-free) or possibly have unspecified other impact via vectors related to session deserialization.

Impact

CVSS base score 9.8 CVSS impact score 5.9 CVSS exploitability score 3.9 confidentialityImpact HIGH integrityImpact HIGH availabilityImpact HIGH

CVE-2016-6290:

CVSS base score 9.8

CVSS impact score 5.9

CVSS exploitability score 3.9

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Detailed information

CVE-2016-6290: ext/session/session.c in PHP before 5.5.38, 5.6.x before 5.6.24, and 7.x before 7.0.9 does not properly maintain a certain hash data structure, which allows remote attackers to cause a denial of service (use-after-free) or possibly have unspecified other impact via vectors related to session deserialization.

Affected systems

  • php php 5.5.37
  • php php 5.6.0
  • php php 5.6.1
  • php php 5.6.2
  • php php 5.6.3
  • php php 5.6.4
  • php php 5.6.5
  • php php 5.6.6
  • php php 5.6.7
  • php php 5.6.8
  • php php 5.6.9
  • php php 5.6.10
  • php php 5.6.11
  • php php 5.6.12
  • php php 5.6.13
  • php php 5.6.14
  • php php 5.6.15
  • php php 5.6.16
  • php php 5.6.17
  • php php 5.6.18
  • php php 5.6.19
  • php php 5.6.20
  • php php 5.6.21
  • php php 5.6.22
  • php php 5.6.23
  • php php 7.0.0
  • php php 7.0.1
  • php php 7.0.2
  • php php 7.0.3
  • php php 7.0.4
  • php php 7.0.5
  • php php 7.0.8

Ease of attack

CVE-2016-6290:

Access Vector

Access Complexity

Authentication

False positives

None known

False negatives

None known

Corrective action

Upgrade to the latest non-affected version of the software.

Apply the appropriate vendor supplied patches.

Contributors

  • Talos research team.
  • This document was generated from data supplied by the national vulnerability database, a product of the national institute of standards and technology.
  • For more information see nvd.

Additional References

  • bugs.php.net/bug.php?id=72562