CVE-2021-21290: Local Information Disclosure Vulnerability in Netty on Unix-Like systems due temporary files
Fixed in 4.1.59.Final · Affected: netty before 4.1.59.Final · Exploitation: possible (1 to 10%)
Not in CyberSIXT coverage yet: no article names this CVE. This page shows the public record.
Higher than 78% of scored CVEs
DescriptionCVE.org
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.
Affected products1
From the CVE record. A product or version that is not listed is unknown, not unaffected.
- netty · netty< 4.1.59.Final
On the Atlas
Every published CVE is on the CyberSIXT Atlas, grouped by weakness, vendor and month.
- Exploitation
- Possible (1 to 10%). EPSS between 1% and 10%.
- CISA KEV
- Not listed
- Public check
- No public nuclei template
- Vendor
- netty
- Published
- February 2021
CoverageNo articles yet
No CyberSIXT article names CVE-2021-21290 yet, so there is no coverage timeline, action brief or change log for it. Everything on this page comes from the public CVE record, CISA KEV, EPSS and the nuclei template index. Search the archive or see the CVEs in the news.
References
- NVD entrynvd.nist.gov
- CVE recordcve.org
- Weakness CWE-378cwe.mitre.org
- Vendor advisorydebian.org
- github.com/netty/netty/security/advisories/GHSA-5mcr-gq6c-3hq2github.com
- github.com/netty/netty/commit/c735357bf29d07856ad171c6611a2e1a0egithub.com
- oracle.com/security-alerts/cpuApr2021.htmloracle.com
- lists.apache.org/thread.html/r0053443ce19ff125981559f8c51cf66e3alists.apache.org
- oracle.com//security-alerts/cpujul2021.htmloracle.com
- oracle.com/security-alerts/cpuoct2021.htmloracle.com
- oracle.com/security-alerts/cpuapr2022.htmloracle.com
- security.netapp.com/advisory/ntap-20220210-0011security.netapp.com
- Mailing listlists.debian.org
- Mailing listlists.apache.org
- Mailing listlists.apache.org
27 more references are in the CVE record.