Race Condition Affecting kernel-uek-debug package, versions <0:2.6.39-400.311.1.el5uek


Severity

high

    Threat Intelligence

    EPSS
    0.04% (6th percentile)

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  • Snyk ID SNYK-ORACLE5-KERNELUEKDEBUG-2546337
  • published 10 Apr 2022
  • disclosed 12 Apr 2019

How to fix?

Upgrade Oracle:5 kernel-uek-debug to version 0:2.6.39-400.311.1.el5uek or higher.
This issue was patched in ELSA-2019-4646.

NVD Description

Note: Versions mentioned in the description apply only to the upstream kernel-uek-debug package and not the kernel-uek-debug package as distributed by Oracle. See How to fix? for Oracle:5 relevant fixed versions and status.

The Linux kernel before 4.8 allows local users to bypass ASLR on setuid programs (such as /bin/su) because install_exec_creds() is called too late in load_elf_binary() in fs/binfmt_elf.c, and thus the ptrace_may_access() check has a race condition when reading /proc/pid/stat.

CVSS Scores

version 3.1
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Snyk

4.7 high
  • Attack Vector (AV)
    Local
  • Attack Complexity (AC)
    High
  • Privileges Required (PR)
    Low
  • User Interaction (UI)
    None
  • Scope (S)
    Unchanged
  • Confidentiality (C)
    High
  • Integrity (I)
    None
  • Availability (A)
    None
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NVD

4.7 medium
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Red Hat

3.3 low