Integer Underflow Affecting shim-aa64 package, versions <0:15.6-1.el8


Severity

Recommended
0.0
high
0
10

Based on Red Hat Enterprise Linux security rating

    Threat Intelligence

    EPSS
    0.13% (49th percentile)

Do your applications use this vulnerable package?

In a few clicks we can analyze your entire application and see what components are vulnerable in your application, and suggest you quick fixes.

Test your applications
  • Snyk ID SNYK-RHEL8-SHIMAA64-4286569
  • published 9 Jun 2022
  • disclosed 7 Jun 2022

How to fix?

Upgrade RHEL:8 shim-aa64 to version 0:15.6-1.el8 or higher.
This issue was patched in RHSA-2022:5095.

NVD Description

Note: Versions mentioned in the description apply only to the upstream shim-aa64 package and not the shim-aa64 package as distributed by RHEL. See How to fix? for RHEL: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
Expand this section

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
Expand this section

Red Hat

8.1 high
Expand this section

SUSE

8.8 high