Integer Underflow Affecting grub2-efi-ia32-cdboot package, versions <1:2.02-0.87.0.21.el7_9.9


Severity

Recommended
0.0
high
0
10

Based on Oracle Linux security rating

    Threat Intelligence

    EPSS
    0.13% (49th percentile)

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  • Snyk ID SNYK-ORACLE7-GRUB2EFIIA32CDBOOT-2862666
  • published 8 Jun 2022
  • disclosed 20 Jul 2023

How to fix?

Upgrade Oracle:7 grub2-efi-ia32-cdboot to version 1:2.02-0.87.0.21.el7_9.9 or higher.
This issue was patched in ELSA-2022-9469.

NVD Description

Note: Versions mentioned in the description apply only to the upstream grub2-efi-ia32-cdboot package and not the grub2-efi-ia32-cdboot package as distributed by Oracle. See How to fix? for Oracle:7 relevant fixed versions and status.

Integer underflow in grub_net_recv_ip4_packets; A malicious crafted IP packet can lead to an integer underflow in grub_net_recv_ip4_packets() function on rsm->total_len value. Under certain circumstances the total_len value may end up wrapping around to a small integer number which will be used in memory allocation. If the attack succeeds in such way, subsequent operations can write past the end of the buffer.

CVSS Scores

version 3.1
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NVD

8.1 high
  • Attack Vector (AV)
    Network
  • Attack Complexity (AC)
    High
  • Privileges Required (PR)
    None
  • User Interaction (UI)
    None
  • Scope (S)
    Unchanged
  • Confidentiality (C)
    High
  • Integrity (I)
    High
  • Availability (A)
    High
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SUSE

8.8 high
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Red Hat

8.1 high