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cve[email protected]CVE-2021-21290
HistoryFeb 08, 2021 - 8:15 p.m.

CVE-2021-21290

2021-02-0820:15:12
CWE-379
CWE-668
CWE-378
[email protected]
web.nvd.nist.gov
300
23
netty
vulnerability
cve-2021-21290
unix-like systems
information disclosure
temporary directory
security patch

1.9 Low

CVSS2

Attack Vector

LOCAL

Attack Complexity

MEDIUM

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

NONE

Availability Impact

NONE

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

6.2 Medium

CVSS3

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

NONE

Availability Impact

NONE

CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

5.8 Medium

AI Score

Confidence

High

0.0004 Low

EPSS

Percentile

13.5%

JSON

Netty is an open-source, asynchronous event-driven network application framework for rapid development of maintainable high performance protocol servers & clients. In Netty before version 4.1.59.Final there is a vulnerability on Unix-like systems involving an insecure temp file. When nettyโ€™s multipart decoders are used local information disclosure can occur via the local system temporary directory if temporary storing uploads on the disk is enabled. On unix-like systems, the temporary directory is shared between all user. As such, writing to this directory using APIs that do not explicitly set the file/directory permissions can lead to information disclosure. Of note, this does not impact modern MacOS Operating Systems. The method โ€œFile.createTempFileโ€ on unix-like systems creates a random file, but, by default will create this file with the permissions โ€œ-rw-rโ€“rโ€“โ€. Thus, if sensitive information is written to this file, other local users can read this information. This is the case in nettyโ€™s โ€œAbstractDiskHttpDataโ€ is vulnerable. This has been fixed in version 4.1.59.Final. As a workaround, one may specify your own โ€œjava.io.tmpdirโ€ when you start the JVM or use โ€œDefaultHttpDataFactory.setBaseDir(โ€ฆ)โ€ to set the directory to something that is only readable by the current user.

Affected configurations

Vulners
NVD
Node
nettynettyRange<4.1.59.Final
VendorProductVersionCPE
nettynetty*cpe:2.3:a:netty:netty:*:*:*:*:*:*:*:*

CNA Affected

[
  {
    "product": "netty",
    "vendor": "netty",
    "versions": [
      {
        "status": "affected",
        "version": "< 4.1.59.Final"
      }
    ]
  }
]

References

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1.9 Low

CVSS2

Attack Vector

LOCAL

Attack Complexity

MEDIUM

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

NONE

Availability Impact

NONE

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

6.2 Medium

CVSS3

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

NONE

Availability Impact

NONE

CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

5.8 Medium

AI Score

Confidence

High

0.0004 Low

EPSS

Percentile

13.5%

JSON
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