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Advisories

dhcpcd Stack Out-of-Bounds Write in dhcp6_makemessage()

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severity
medium
date
Affecting

  • dhcpcd <= 10.3.2, fixed in commit 2f00c7b

CWE
  • CWE-787 Out-of-bounds Write
CVSS
6
CVSS V4 Vector
CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
References
Credit
CuB3y0nd
Description
dhcpcd through 10.3.2, fixed in commit 2f00c7b, contains a one-byte stack out-of-bounds write vulnerability in dhcp6_makemessage() in src/dhcp6.c that allows unauthenticated same-link attackers to write beyond a fixed local buffer by serializing an oversized RFC6603 OPTION_PD_EXCLUDE option body. Attackers can send a crafted DHCPv6 ADVERTISE message containing an IA_PD IAPREFIX /0 with a valid OPTION_PD_EXCLUDE using an exclude prefix length of /121 through /128 to trigger the out-of-bounds write and potentially corrupt adjacent stack memory.

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