CVE-2021-3466: Buffer Overflow
First published: Mon Mar 15 2021(Updated: )
A flaw was found in libmicrohttpd. A missing bounds check in the post_process_urlencoded function leads to a buffer overflow, allowing a remote attacker to write arbitrary data in an application that uses libmicrohttpd. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability. Only version 0.9.70 is vulnerable.
Credit: secalert@redhat.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| redhat/libmicrohttpd | <0.9.71 | 0.9.71 |
| Libmicrohttpd | =0.9.70 | |
| Red Hat Enterprise Linux | =6.0 | |
| Red Hat Enterprise Linux | =7.0 | |
| Red Hat Enterprise Linux | =8.0 | |
| Fedora | =32 | |
| Fedora | =33 | |
| Fedora | =34 |
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Reference Links
- https://bugzilla.redhat.com/show_bug.cgi?id=1939127
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/4334XJNDJPYQNFE6S3S2KUJJ7TMHYCWL/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/75HDMREKITMGPGE62NP7KE62ZJVLETXN/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/K5NEPVGP3L2CZHLZ4UB44PEILHKPDBOG/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/4334XJNDJPYQNFE6S3S2KUJJ7TMHYCWL/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/K5NEPVGP3L2CZHLZ4UB44PEILHKPDBOG/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/75HDMREKITMGPGE62NP7KE62ZJVLETXN/
- https://security.gentoo.org/glsa/202311-08
- https://git.gnunet.org/libmicrohttpd.git/commit/?id=a110ae6276660bee3caab30e9ff3f12f85cf3241
- https://git.gnunet.org/libmicrohttpd.git/diff/src/microhttpd/postprocessor.c?id=a110ae6276660bee3caab30e9ff3f12f85cf3241
- https://git.gnunet.org/libmicrohttpd.git/diff/src/microhttpd/test_postprocessor.c?id=a110ae6276660bee3caab30e9ff3f12f85cf3241
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1939128
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1939129
- https://git.gnunet.org/libmicrohttpd.git/commit/?id=55f715e15e3ce66babc939b5a670bee02d4d9571
Frequently Asked Questions
What is the severity of CVE-2021-3466?
CVE-2021-3466 has a high severity rating due to the potential buffer overflow that can compromise data confidentiality.
How do I fix CVE-2021-3466?
To fix CVE-2021-3466, update libmicrohttpd to version 0.9.71 or later.
Which versions of libmicrohttpd are affected by CVE-2021-3466?
CVE-2021-3466 affects libmicrohttpd versions 0.9.70 and earlier.
What types of applications are at risk due to CVE-2021-3466?
Applications that use vulnerable versions of libmicrohttpd are at risk from CVE-2021-3466.
Is CVE-2021-3466 related to any specific operating systems?
Yes, CVE-2021-3466 impacts Red Hat Enterprise Linux and Fedora operating systems running affected versions of libmicrohttpd.
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