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HannoH1:477897

HistoryJan 11, 2019 - 10:11 a.m.

Internet Bug Bounty: buffer overread in base64 code of the xmlrpc module

2019-01-1110:11:55

hanno

hackerone.com

$500

7.5 High

CVSS3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

NONE

Availability Impact

NONE

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

5 Medium

CVSS2

Access Vector

NETWORK

Access Complexity

LOW

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

NONE

Availability Impact

NONE

AV:N/AC:L/Au:N/C:P/I:N/A:N

0.009 Low

EPSS

Percentile

80.0%

JSON

Malformed input to the xmlrpc_decode function can cause an out of bounds read in the base64 code.

This is fixed in the latest updates of PHP (7.3.1 etc.)

Report:
https://bugs.php.net/bug.php?id=77380

Impact

If the attacker has access to the decoded output this may leak memory contents.

7.5 High

CVSS3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

NONE

Availability Impact

NONE

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

5 Medium

CVSS2

Access Vector

NETWORK

Access Complexity

LOW

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

NONE

Availability Impact

NONE

AV:N/AC:L/Au:N/C:P/I:N/A:N

0.009 Low

EPSS

Percentile

80.0%

JSON

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