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{
"CVE_data_meta" : {
"ASSIGNER" : "cve@mitre.org" ,
"ID" : "CVE-2018-18955" ,
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"STATE" : "PUBLIC"
} ,
"affects" : {
"vendor" : {
"vendor_data" : [
{
"product" : {
"product_data" : [
{
"product_name" : "n/a" ,
"version" : {
"version_data" : [
{
"version_value" : "n/a"
}
]
}
}
]
} ,
"vendor_name" : "n/a"
}
]
}
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} ,
"data_format" : "MITRE" ,
"data_type" : "CVE" ,
"data_version" : "4.0" ,
"description" : {
"description_data" : [
{
"lang" : "eng" ,
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"value" : "In the Linux kernel 4.15.x through 4.19.x before 4.19.2, map_write() in kernel/user_namespace.c allows privilege escalation because it mishandles nested user namespaces with more than 5 UID or GID ranges. A user who has CAP_SYS_ADMIN in an affected user namespace can bypass access controls on resources outside the namespace, as demonstrated by reading /etc/shadow. This occurs because an ID transformation takes place properly for the namespaced-to-kernel direction but not for the kernel-to-namespaced direction."
}
]
} ,
"problemtype" : {
"problemtype_data" : [
{
"description" : [
{
"lang" : "eng" ,
"value" : "n/a"
}
]
}
]
} ,
"references" : {
"reference_data" : [
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{
"name" : "45886" ,
"refsource" : "EXPLOIT-DB" ,
"url" : "https://www.exploit-db.com/exploits/45886/"
} ,
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{
"name" : "45915" ,
"refsource" : "EXPLOIT-DB" ,
"url" : "https://www.exploit-db.com/exploits/45915/"
} ,
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{
"name" : "http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=d2f007dbe7e4c9583eea6eb04d60001e85c6f1bd" ,
"refsource" : "MISC" ,
"url" : "http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=d2f007dbe7e4c9583eea6eb04d60001e85c6f1bd"
} ,
{
"name" : "https://bugs.chromium.org/p/project-zero/issues/detail?id=1712" ,
"refsource" : "MISC" ,
"url" : "https://bugs.chromium.org/p/project-zero/issues/detail?id=1712"
} ,
{
"name" : "https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.18.19" ,
"refsource" : "MISC" ,
"url" : "https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.18.19"
} ,
{
"name" : "https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.19.2" ,
"refsource" : "MISC" ,
"url" : "https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.19.2"
} ,
{
"name" : "https://github.com/torvalds/linux/commit/d2f007dbe7e4c9583eea6eb04d60001e85c6f1bd" ,
"refsource" : "MISC" ,
"url" : "https://github.com/torvalds/linux/commit/d2f007dbe7e4c9583eea6eb04d60001e85c6f1bd"
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} ,
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{
"name" : "USN-3832-1" ,
"refsource" : "UBUNTU" ,
"url" : "https://usn.ubuntu.com/3832-1/"
} ,
{
"name" : "USN-3833-1" ,
"refsource" : "UBUNTU" ,
"url" : "https://usn.ubuntu.com/3833-1/"
} ,
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{
"name" : "USN-3835-1" ,
"refsource" : "UBUNTU" ,
"url" : "https://usn.ubuntu.com/3835-1/"
} ,
{
"name" : "USN-3836-1" ,
"refsource" : "UBUNTU" ,
"url" : "https://usn.ubuntu.com/3836-1/"
} ,
{
"name" : "USN-3836-2" ,
"refsource" : "UBUNTU" ,
"url" : "https://usn.ubuntu.com/3836-2/"
} ,
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{
"name" : "105941" ,
"refsource" : "BID" ,
"url" : "http://www.securityfocus.com/bid/105941"
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}
]
}
}