Security Bulletin: IBM® Db2® performs unsafe deserialization in DB2 JDBC driver (CVE-2017-1677)

Summary

The Db2 JDBC driver deserializes an object unsafely potentially leading to arbitrary code execution.

Vulnerability Details

CVEID: CVE-2017-1677 DESCRIPTION: IBM Data Server Driver for JDBC and SQLJ deserializes the contents of /tmp/connlicj.bin which leads to object injection and potentially arbitrary code execution depending on the classpath.
CVSS Base Score: 7.4
CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/133999 for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H)

Affected Products and Versions

All fix pack levels of IBM Db2 V9.7, V10.1, V10.5, and V11.1 editions on all platforms are affected.

Remediation/Fixes

The recommended solution is to apply the appropriate fix for this vulnerability.

FIX:

The fix for DB2 V11.1 is in V11.1.3 FP3, available for download from Fix Central.

Customers running any vulnerable fixpack level of an affected Program, V9.7, V10.1, and V10.5, can download the special build containing the interim fix for this issue from Fix Central. These special builds are available based on the most recent fixpack level for each impacted release: DB2 V9.7 FP11, V10.1 FP6, and V10.5 FP9. They can be applied to any affected fixpack level of the appropriate release to remediate this vulnerability.

• JCC version 3.72.41/4.23.48
  See workaround or contact support
  V10.1 | TBD | IT23798 | Special Build for V10.1 FP6:
  AIX 64-bit
  HP-UX 64-bit
  Linux 32-bit, x86-32
  Linux 64-bit, x86-64
  Linux 64-bit, POWER™ big endian
  Linux 64-bit, System z®, System z9® or zSeries®
  Solaris 64-bit, SPARC
  Solaris 64-bit, x86-64
  Windows 32-bit, x86
  Windows 64-bit, x86 |

• JCC version 3.69.75/4.19.76
  See workaround or contact support
  V10.5 | FP10 | IT23797 | <https://www-01.ibm.com/support/docview.wss?uid=swg24045012&gt; |

• JCC version 3.69.76/4.19.77
  See workaround or contact support
  V11.1.3 | FP3 | IT23794 | <https://www-01.ibm.com/support/docview.wss?uid=swg24044630&gt; |

• JCC version 3.72.41/4.23.48
  See workaround or contact support

Workarounds and Mitigations

The user can set the default output directory to a more secure location for the connlicj.bin file by modifying the db2.jcc.outputDirectory property. The driver will write the cache file to the configured location which cannot be accessed without proper authorization, which will avoid the object injection.