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privacy: Potential JSON injection #1304

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merged 4 commits into from
May 28, 2020
Merged

privacy: Potential JSON injection #1304

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fa02275
privacy: Do not construct JSON by concatenating strings.
djcsdy May 17, 2020
255fc04
privacy: Add tests to illustrate JSON injection bug.
djcsdy May 17, 2020
27e2e11
privacy: Do not modify User.Ext or Regs.Ext if json.Marshal reports a…
djcsdy May 27, 2020
5d4c2a2
privacy: Mutate JSON by unmarshalling to a map, modifying, and marsha…
djcsdy May 28, 2020
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12 changes: 8 additions & 4 deletions privacy/ccpa/policy.go
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Original file line number Diff line number Diff line change
Expand Up @@ -40,13 +40,17 @@ func (p Policy) Write(req *openrtb.BidRequest) error {
req.Regs = &openrtb.Regs{}
}

var err error

if req.Regs.Ext == nil {
req.Regs.Ext = json.RawMessage(`{"us_privacy":"` + p.Value + `"}`)
return nil
req.Regs.Ext, err = json.Marshal(openrtb_ext.ExtRegs{USPrivacy: p.Value})
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return err
}

var err error
req.Regs.Ext, err = jsonparser.Set(req.Regs.Ext, []byte(`"`+p.Value+`"`), "us_privacy")
jsonString, err := json.Marshal(p.Value)
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if err == nil {
req.Regs.Ext, err = jsonparser.Set(req.Regs.Ext, jsonString, "us_privacy")
}
return err
}

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37 changes: 37 additions & 0 deletions privacy/ccpa/policy_test.go
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Original file line number Diff line number Diff line change
Expand Up @@ -71,6 +71,17 @@ func TestRead(t *testing.T) {
},
expectedError: true,
},
{
description: "Injection Attack",
request: &openrtb.BidRequest{
Regs: &openrtb.Regs{
Ext: json.RawMessage(`{"us_privacy":"1YYY\"},\"oops\":\"malicious\",\"p\":{\"p\":\""}`),
},
},
expectedPolicy: Policy{
Value: "1YYY\"},\"oops\":\"malicious\",\"p\":{\"p\":\"",
},
},
}

for _, test := range testCases {
Expand Down Expand Up @@ -138,6 +149,32 @@ func TestWrite(t *testing.T) {
Ext: json.RawMessage(`malformed`)}},
expectedError: true,
},
{
description: "Injection Attack With Nil Request Regs Object",
policy: Policy{Value: "1YYY\"},\"oops\":\"malicious\",\"p\":{\"p\":\""},
request: &openrtb.BidRequest{},
expected: &openrtb.BidRequest{Regs: &openrtb.Regs{
Ext: json.RawMessage(`{"us_privacy":"1YYY\"},\"oops\":\"malicious\",\"p\":{\"p\":\""}`),
}},
},
{
description: "Injection Attack With Nil Request Regs Ext Object",
policy: Policy{Value: "1YYY\"},\"oops\":\"malicious\",\"p\":{\"p\":\""},
request: &openrtb.BidRequest{Regs: &openrtb.Regs{}},
expected: &openrtb.BidRequest{Regs: &openrtb.Regs{
Ext: json.RawMessage(`{"us_privacy":"1YYY\"},\"oops\":\"malicious\",\"p\":{\"p\":\""}`),
}},
},
{
description: "Injection Attack With Existing Request Regs Ext Object",
policy: Policy{Value: "1YYY\"},\"oops\":\"malicious\",\"p\":{\"p\":\""},
request: &openrtb.BidRequest{Regs: &openrtb.Regs{
Ext: json.RawMessage(`{"existing":"any"}`),
}},
expected: &openrtb.BidRequest{Regs: &openrtb.Regs{
Ext: json.RawMessage(`{"existing":"any","us_privacy":"1YYY\"},\"oops\":\"malicious\",\"p\":{\"p\":\""}`),
}},
},
}

for _, test := range testCases {
Expand Down
13 changes: 9 additions & 4 deletions privacy/gdpr/policy.go
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Original file line number Diff line number Diff line change
Expand Up @@ -2,6 +2,7 @@ package gdpr

import (
"encoding/json"
"github.com/prebid/prebid-server/openrtb_ext"

"github.com/buger/jsonparser"
"github.com/mxmCherry/openrtb"
Expand All @@ -24,13 +25,17 @@ func (p Policy) Write(req *openrtb.BidRequest) error {
req.User = &openrtb.User{}
}

var err error

if req.User.Ext == nil {
req.User.Ext = json.RawMessage(`{"consent":"` + p.Consent + `"}`)
return nil
req.User.Ext, err = json.Marshal(openrtb_ext.ExtUser{Consent: p.Consent})
return err
}

var err error
req.User.Ext, err = jsonparser.Set(req.User.Ext, []byte(`"`+p.Consent+`"`), "consent")
jsonString, err := json.Marshal(p.Consent)
if err == nil {
req.User.Ext, err = jsonparser.Set(req.User.Ext, jsonString, "consent")
}
return err
}

Expand Down
26 changes: 26 additions & 0 deletions privacy/gdpr/policy_test.go
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Original file line number Diff line number Diff line change
Expand Up @@ -59,6 +59,32 @@ func TestWrite(t *testing.T) {
Ext: json.RawMessage(`malformed`)}},
expectedError: true,
},
{
description: "Injection Attack With Nil Request User Object",
policy: Policy{Consent: "BONV8oqONXwgmADACHENAO7pqzAAppY\"},\"oops\":\"malicious\",\"p\":{\"p\":\""},
request: &openrtb.BidRequest{},
expected: &openrtb.BidRequest{User: &openrtb.User{
Ext: json.RawMessage(`{"consent":"BONV8oqONXwgmADACHENAO7pqzAAppY\"},\"oops\":\"malicious\",\"p\":{\"p\":\""}`),
}},
},
{
description: "Injection Attack With Nil Request User Ext Object",
policy: Policy{Consent: "BONV8oqONXwgmADACHENAO7pqzAAppY\"},\"oops\":\"malicious\",\"p\":{\"p\":\""},
request: &openrtb.BidRequest{User: &openrtb.User{}},
expected: &openrtb.BidRequest{User: &openrtb.User{
Ext: json.RawMessage(`{"consent":"BONV8oqONXwgmADACHENAO7pqzAAppY\"},\"oops\":\"malicious\",\"p\":{\"p\":\""}`),
}},
},
{
description: "Injection Attack With Existing Request User Ext Object",
policy: Policy{Consent: "BONV8oqONXwgmADACHENAO7pqzAAppY\"},\"oops\":\"malicious\",\"p\":{\"p\":\""},
request: &openrtb.BidRequest{User: &openrtb.User{
Ext: json.RawMessage(`{"existing":"any"}`),
}},
expected: &openrtb.BidRequest{User: &openrtb.User{
Ext: json.RawMessage(`{"existing":"any","consent":"BONV8oqONXwgmADACHENAO7pqzAAppY\"},\"oops\":\"malicious\",\"p\":{\"p\":\""}`),
}},
},
}

for _, test := range testCases {
Expand Down