The Samba vfs_fruit module uses extended file attributes (EA, xattr) to provide “…enhanced compatibility with Apple SMB clients and interoperability with a Netatalk 3 AFP fileserver.” Samba versions prior to 4.13.17, 4.14.12 and 4.15.5 with vfs_fruit configured allow out-of-bounds heap read and write via specially crafted extended file attributes. A remote attacker with write access to extended file attributes can execute arbitrary code with the privileges of smbd, typically root.
[
{
"vendor": "Samba",
"product": "Samba",
"versions": [
{
"version": "unspecified",
"lessThan": "4.13.17",
"status": "affected",
"versionType": "custom"
},
{
"version": "unspecified",
"lessThan": "4.14.12",
"status": "affected",
"versionType": "custom"
},
{
"version": "unspecified",
"lessThan": "4.15.5",
"status": "affected",
"versionType": "custom"
}
]
}
]