Integer Underflow Affecting shim-ia32 package, versions <0:15.6-1.el8


Severity

0.0
high
0
10

    Threat Intelligence

    EPSS
    0.06% (28th percentile)

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  • Snyk ID SNYK-CENTOS8-SHIMIA32-2931279
  • published 9 Jun 2022
  • disclosed 7 Jun 2022

How to fix?

Upgrade Centos:8 shim-ia32 to version 0:15.6-1.el8 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream shim-ia32 package and not the shim-ia32 package as distributed by Centos. See How to fix? for Centos:8 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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Snyk

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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NVD

8.1 high
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SUSE

8.8 high
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Red Hat

8.1 high