CVE-2021-21290 (GCVE-0-2021-21290)

Vulnerability from cvelistv5 – Published: 2021-02-08 20:10 – Updated: 2024-08-03 18:09
VLAI
Title
Local Information Disclosure Vulnerability in Netty on Unix-Like systems due temporary files
Summary
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 netty'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 "File.createTempFile" on unix-like systems creates a random file, but, by default will create this file with the permissions "-rw-r--r--". Thus, if sensitive information is written to this file, other local users can read this information. This is the case in netty's "AbstractDiskHttpData" is vulnerable. This has been fixed in version 4.1.59.Final. As a workaround, one may specify your own "java.io.tmpdir" when you start the JVM or use "DefaultHttpDataFactory.setBaseDir(...)" to set the directory to something that is only readable by the current user.
Severity
6.2 (Medium)
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
CWE
  • CWE-378 - Creation of Temporary File With Insecure Permissions
  • CWE-379 - Creation of Temporary File in Directory with Insecure Permissions
Assigner
References
URL Tags
https://github.com/netty/netty/security/advisorie… x_refsource_CONFIRM
https://github.com/netty/netty/commit/c735357bf29… x_refsource_MISC
https://lists.debian.org/debian-lts-announce/2021… mailing-listx_refsource_MLIST
https://lists.apache.org/thread.html/rc488f800948… mailing-listx_refsource_MLIST
https://lists.apache.org/thread.html/r2748097ea4b… mailing-listx_refsource_MLIST
https://lists.apache.org/thread.html/ra503756ced7… mailing-listx_refsource_MLIST
https://lists.apache.org/thread.html/r10308b625e4… mailing-listx_refsource_MLIST
https://lists.apache.org/thread.html/r2fda4dab730… mailing-listx_refsource_MLIST
https://lists.apache.org/thread.html/r326ec431f06… mailing-listx_refsource_MLIST
https://lists.apache.org/thread.html/rdba4f78ac55… mailing-listx_refsource_MLIST
https://lists.apache.org/thread.html/r0857b613604… mailing-listx_refsource_MLIST
https://lists.apache.org/thread.html/r5e4a5400897… mailing-listx_refsource_MLIST
https://lists.apache.org/thread.html/r71dbb66747f… mailing-listx_refsource_MLIST
https://lists.apache.org/thread.html/ra0fc2b4553d… mailing-listx_refsource_MLIST
https://lists.apache.org/thread.html/r5bf303d7c04… mailing-listx_refsource_MLIST
https://lists.apache.org/thread.html/r743149dcc8d… mailing-listx_refsource_MLIST
https://lists.apache.org/thread.html/r4efed2c5016… mailing-listx_refsource_MLIST
https://lists.apache.org/thread.html/r02e467123d4… mailing-listx_refsource_MLIST
https://lists.apache.org/thread.html/r7bb3cdc192e… mailing-listx_refsource_MLIST
https://lists.apache.org/thread.html/rcd163e42127… mailing-listx_refsource_MLIST
https://lists.apache.org/thread.html/r9924ef93575… mailing-listx_refsource_MLIST
https://lists.apache.org/thread.html/rb51d6202ff1… mailing-listx_refsource_MLIST
https://lists.apache.org/thread.html/r790c2926efc… mailing-listx_refsource_MLIST
https://lists.apache.org/thread.html/r1908a34b9cc… mailing-listx_refsource_MLIST
https://lists.apache.org/thread.html/rb06c1e766aa… mailing-listx_refsource_MLIST
https://lists.apache.org/thread.html/r5e66e286afb… mailing-listx_refsource_MLIST
https://lists.apache.org/thread.html/rb592033a246… mailing-listx_refsource_MLIST
https://lists.apache.org/thread.html/r59bac5c09f7… mailing-listx_refsource_MLIST
https://lists.apache.org/thread.html/rc0087125cb1… mailing-listx_refsource_MLIST
https://lists.apache.org/thread.html/r2936730ef0a… mailing-listx_refsource_MLIST
https://www.debian.org/security/2021/dsa-4885 vendor-advisoryx_refsource_DEBIAN
https://www.oracle.com/security-alerts/cpuApr2021.html x_refsource_MISC
https://lists.apache.org/thread.html/r0053443ce19… x_refsource_MISC
https://lists.apache.org/thread.html/r5c701840aa2… mailing-listx_refsource_MLIST
https://www.oracle.com//security-alerts/cpujul2021.html x_refsource_MISC
https://www.oracle.com/security-alerts/cpuoct2021.html x_refsource_MISC
https://lists.apache.org/thread.html/r584cf871f18… mailing-listx_refsource_MLIST
https://www.oracle.com/security-alerts/cpuapr2022.html x_refsource_MISC
https://security.netapp.com/advisory/ntap-2022021… x_refsource_CONFIRM
Impacted products
Vendor Product Version
netty netty Affected: < 4.1.59.Final
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    "cna": {
      "affected": [
        {
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          "vendor": "netty",
          "versions": [
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              "version": "\u003c 4.1.59.Final"
            }
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        {
          "lang": "en",
          "value": "Netty is an open-source, asynchronous event-driven network application framework for rapid development of maintainable high performance protocol servers \u0026 clients. In Netty before version 4.1.59.Final there is a vulnerability on Unix-like systems involving an insecure temp file. When netty\u0027s 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 \"File.createTempFile\" on unix-like systems creates a random file, but, by default will create this file with the permissions \"-rw-r--r--\". Thus, if sensitive information is written to this file, other local users can read this information. This is the case in netty\u0027s \"AbstractDiskHttpData\" is vulnerable. This has been fixed in version 4.1.59.Final. As a workaround, one may specify your own \"java.io.tmpdir\" when you start the JVM or use \"DefaultHttpDataFactory.setBaseDir(...)\" to set the directory to something that is only readable by the current user."
        }
      ],
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              "url": "https://lists.apache.org/thread.html/r326ec431f06eab7cb7113a7a338e59731b8d556d05258457f12bac1b@%3Cdev.kafka.apache.org%3E"
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              "name": "[kafka-jira] 20210302 [jira] [Resolved] (KAFKA-12389) Upgrade of netty-codec due to CVE-2021-21290",
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              "url": "https://lists.apache.org/thread.html/rdba4f78ac55f803893a1a2265181595e79e3aa027e2e651dfba98c18@%3Cjira.kafka.apache.org%3E"
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              "name": "[kafka-jira] 20210302 [GitHub] [kafka] omkreddy closed pull request #10235: KAFKA-12389: Upgrade of netty-codec due to CVE-2021-21290",
              "refsource": "MLIST",
              "url": "https://lists.apache.org/thread.html/r0857b613604c696bf9743f0af047360baaded48b1c75cf6945a083c5@%3Cjira.kafka.apache.org%3E"
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              "name": "[kafka-commits] 20210302 [kafka] branch 2.6 updated: KAFKA-12389: Upgrade of netty-codec due to CVE-2021-21290",
              "refsource": "MLIST",
              "url": "https://lists.apache.org/thread.html/r5e4a540089760c8ecc2c411309d74264f1dad634ad93ad583ca16214@%3Ccommits.kafka.apache.org%3E"
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              "name": "[kafka-commits] 20210302 [kafka] branch 2.7 updated: KAFKA-12389: Upgrade of netty-codec due to CVE-2021-21290",
              "refsource": "MLIST",
              "url": "https://lists.apache.org/thread.html/r71dbb66747ff537640bb91eb0b2b24edef21ac07728097016f58b01f@%3Ccommits.kafka.apache.org%3E"
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              "name": "[kafka-jira] 20210302 [GitHub] [kafka] dongjinleekr commented on pull request #10235: KAFKA-12389: Upgrade of netty-codec due to CVE-2021-21290",
              "refsource": "MLIST",
              "url": "https://lists.apache.org/thread.html/ra0fc2b4553dd7aaf75febb61052b7f1243ac3a180a71c01f29093013@%3Cjira.kafka.apache.org%3E"
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              "name": "[zookeeper-issues] 20210311 [jira] [Created] (ZOOKEEPER-4242) Upgrade Netty library to \u003e 4.1.59 due to security vulnerability",
              "refsource": "MLIST",
              "url": "https://lists.apache.org/thread.html/r5bf303d7c04da78f276765da08559fdc62420f1df539b277ca31f63b@%3Cissues.zookeeper.apache.org%3E"
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            {
              "name": "[zookeeper-dev] 20210311 [jira] [Created] (ZOOKEEPER-4242) Upgrade Netty library to \u003e 4.1.59 due to security vulnerability",
              "refsource": "MLIST",
              "url": "https://lists.apache.org/thread.html/r743149dcc8db1de473e6bff0b3ddf10140a7357bc2add75f7d1fbb12@%3Cdev.zookeeper.apache.org%3E"
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              "name": "[tinkerpop-dev] 20210316 [jira] [Created] (TINKERPOP-2535) Netty 4.1.52 flagged as medium security violation",
              "refsource": "MLIST",
              "url": "https://lists.apache.org/thread.html/r4efed2c501681cb2e8d629da16e48d9eac429624fd4c9a8c6b8e7020@%3Cdev.tinkerpop.apache.org%3E"
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            {
              "name": "[ranger-dev] 20210317 [jira] [Created] (RANGER-3209) Upgrade netty to 4.1.60+ due to CVE-2021-21290 and CVE-2021-21295",
              "refsource": "MLIST",
              "url": "https://lists.apache.org/thread.html/r02e467123d45006a1dda20a38349e9c74c3a4b53e2e07be0939ecb3f@%3Cdev.ranger.apache.org%3E"
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              "name": "[ranger-dev] 20210317 [jira] [Assigned] (RANGER-3209) Upgrade netty to 4.1.60+ due to CVE-2021-21290 and CVE-2021-21295",
              "refsource": "MLIST",
              "url": "https://lists.apache.org/thread.html/r7bb3cdc192e9a6f863d3ea05422f09fa1ae2b88d4663e63696ee7ef5@%3Cdev.ranger.apache.org%3E"
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              "name": "[pulsar-commits] 20210329 [GitHub] [pulsar] yaswanthnadella opened a new issue #10071: CVE-2021-21295 \u0026 CVE-2021-21290",
              "refsource": "MLIST",
              "url": "https://lists.apache.org/thread.html/rcd163e421273e8dca1c71ea298dce3dd11b41d51c3a812e0394e6a5d@%3Ccommits.pulsar.apache.org%3E"
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              "name": "[pulsar-commits] 20210329 [GitHub] [pulsar] aahmed-se opened a new pull request #10073: Upgrade Netty version to 4.1.60.final",
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              "url": "https://lists.apache.org/thread.html/r9924ef9357537722b28d04c98a189750b80694a19754e5057c34ca48@%3Ccommits.pulsar.apache.org%3E"
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              "name": "[pulsar-commits] 20210329 [GitHub] [pulsar] merlimat closed issue #10071: CVE-2021-21295 \u0026 CVE-2021-21290",
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              "url": "https://lists.apache.org/thread.html/rb51d6202ff1a773f96eaa694b7da4ad3f44922c40b3d4e1a19c2f325@%3Ccommits.pulsar.apache.org%3E"
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              "name": "[bookkeeper-issues] 20210330 [GitHub] [bookkeeper] eolivelli opened a new issue #2669: Update Netty to 4.1.60.final",
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              "name": "[zookeeper-dev] 20210330 [jira] [Created] (ZOOKEEPER-4272) Upgrade Netty library to \u003e 4.1.60 due to security vulnerability CVE-2021-21295",
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              "url": "https://lists.apache.org/thread.html/r1908a34b9cc7120e5c19968a116ddbcffea5e9deb76c2be4fa461904@%3Cdev.zookeeper.apache.org%3E"
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              "url": "https://lists.apache.org/thread.html/rb06c1e766aa45ee422e8261a8249b561784186483e8f742ea627bda4@%3Cdev.kafka.apache.org%3E"
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              "name": "[kafka-jira] 20210330 [jira] [Updated] (KAFKA-12583) Upgrade of netty-codec due to CVE-2021-21295",
              "refsource": "MLIST",
              "url": "https://lists.apache.org/thread.html/r5e66e286afb5506cdfe9bbf68a323e8d09614f6d1ddc806ed0224700@%3Cjira.kafka.apache.org%3E"
            },
            {
              "name": "[zookeeper-issues] 20210330 [jira] [Created] (ZOOKEEPER-4272) Upgrade Netty library to \u003e 4.1.60 due to security vulnerability CVE-2021-21295",
              "refsource": "MLIST",
              "url": "https://lists.apache.org/thread.html/rb592033a2462548d061a83ac9449c5ff66098751748fcd1e2d008233@%3Cissues.zookeeper.apache.org%3E"
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            {
              "name": "[kafka-jira] 20210330 [jira] [Created] (KAFKA-12583) Upgrade of netty-codec due to CVE-2021-21295",
              "refsource": "MLIST",
              "url": "https://lists.apache.org/thread.html/r59bac5c09f7a4179b9e2460e8f41c278aaf3b9a21cc23678eb893e41@%3Cjira.kafka.apache.org%3E"
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            {
              "name": "[zookeeper-issues] 20210330 [jira] [Updated] (ZOOKEEPER-4272) Upgrade Netty library to \u003e 4.1.60 due to security vulnerability CVE-2021-21295",
              "refsource": "MLIST",
              "url": "https://lists.apache.org/thread.html/rc0087125cb15b4b78e44000f841cd37fefedfda942fd7ddf3ad1b528@%3Cissues.zookeeper.apache.org%3E"
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              "name": "[zookeeper-issues] 20210402 [jira] [Commented] (ZOOKEEPER-4272) Upgrade Netty library to \u003e 4.1.60 due to security vulnerability CVE-2021-21295",
              "refsource": "MLIST",
              "url": "https://lists.apache.org/thread.html/r2936730ef0a06e724b96539bc7eacfcd3628987c16b1b99c790e7b87@%3Cissues.zookeeper.apache.org%3E"
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            {
              "name": "DSA-4885",
              "refsource": "DEBIAN",
              "url": "https://www.debian.org/security/2021/dsa-4885"
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            {
              "name": "https://www.oracle.com/security-alerts/cpuApr2021.html",
              "refsource": "MISC",
              "url": "https://www.oracle.com/security-alerts/cpuApr2021.html"
            },
            {
              "name": "https://lists.apache.org/thread.html/r0053443ce19ff125981559f8c51cf66e3ab4350f47812b8cf0733a05@%3Cdev.kafka.apache.org%3E",
              "refsource": "MISC",
              "url": "https://lists.apache.org/thread.html/r0053443ce19ff125981559f8c51cf66e3ab4350f47812b8cf0733a05@%3Cdev.kafka.apache.org%3E"
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            {
              "name": "[activemq-users] 20210715 Next ActiveMQ Artemis Release - CVE-2021-21290 vulnerability",
              "refsource": "MLIST",
              "url": "https://lists.apache.org/thread.html/r5c701840aa2845191721e39821445e1e8c59711e71942b7796a6ec29@%3Cusers.activemq.apache.org%3E"
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              "refsource": "MISC",
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              "refsource": "MISC",
              "url": "https://www.oracle.com/security-alerts/cpuoct2021.html"
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            {
              "name": "[pulsar-commits] 20211020 [GitHub] [pulsar] Shoothzj opened a new pull request #12437: [Security] Bump grpc to 1.41.0",
              "refsource": "MLIST",
              "url": "https://lists.apache.org/thread.html/r584cf871f188c406d8bd447ff4e2fd9817fca862436c064d0951a071@%3Ccommits.pulsar.apache.org%3E"
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            {
              "name": "https://security.netapp.com/advisory/ntap-20220210-0011/",
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              "url": "https://security.netapp.com/advisory/ntap-20220210-0011/"
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    "dateReserved": "2020-12-22T00:00:00.000Z",
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  }
}


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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.