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CVE-2022-2601: Buffer overflow in grub_font_construct_glyph() can lead to out-of-bound write and possible secure boot bypass

A buffer overflow was found in grub_font_construct_glyph(). A malicious crafted pf2 font can lead to an overflow when calculating the max_glyph_size value, allocating a smaller than needed buffer for the glyph, this further leads to a buffer overflow and a heap based out-of-bounds write. An attacker may use this vulnerability to circumvent the secure boot mechanism.

CVE
#vulnerability#linux#red_hat#buffer_overflow#sap

Description Marco Benatto 2022-08-01 15:21:57 UTC

A buffer overflow was found in grub_font_construct_glyph(). A malicious crafted pf2 font can lead to an overflow when calculating the max_glyph_size value, allocating a smaller than needed buffer for the glyph, this further leads to a buffer overflow and a heap based out-of-bounds write. An attacker may use this vulnerability to circumvent the secure boot mechanism.

Comment 5 Marco Benatto 2022-11-15 18:09:04 UTC

Created grub2 tracking bugs for this issue:

Affects: fedora-all [bug 2142996]

Comment 7 errata-xmlrpc 2022-12-06 08:54:24 UTC

This issue has been addressed in the following products:

Red Hat Enterprise Linux 8.2 Advanced Update Support Red Hat Enterprise Linux 8.2 Update Services for SAP Solutions Red Hat Enterprise Linux 8.2 Telecommunications Update Service

Via RHSA-2022:8800 https://access.redhat.com/errata/RHSA-2022:8800

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