CVE-2021-43174: gzip transfer encoding caused out-of-memory crash
First published: Tue Nov 09 2021(Updated: )
NLnet Labs Routinator versions 0.9.0 up to and including 0.10.1, support the gzip transfer encoding when querying RRDP repositories. This encoding can be used by an RRDP repository to cause an out-of-memory crash in these versions of Routinator. RRDP uses XML which allows arbitrary amounts of white space in the encoded data. The gzip scheme compresses such white space extremely well, leading to very small compressed files that become huge when being decompressed for further processing, big enough that Routinator runs out of memory when parsing input data waiting for the next XML element.
Credit: sep@nlnetlabs.nl sep@nlnetlabs.nl
| Affected Software | Affected Version | How to fix |
|---|---|---|
| debian/cfrpki | 1.4.2-1~deb11u1 1.4.4-1 1.5.10-2 | |
| NLnet Labs Routinator | >=0.9.0<0.10.2 | |
| Debian GNU/Linux | =11.0 |
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Reference Links
Frequently Asked Questions
What is CVE-2021-43174?
CVE-2021-43174 is a vulnerability in NLnet Labs Routinator versions 0.9.0 up to and including 0.10.1 that allows an RRDP repository to cause an out-of-memory crash by using the gzip transfer encoding.
What is the severity of CVE-2021-43174?
The severity of CVE-2021-43174 is high with a CVSS score of 7.5.
How does CVE-2021-43174 affect NLnet Labs Routinator?
CVE-2021-43174 affects NLnet Labs Routinator versions 0.9.0 up to and including 0.10.1.
How can an RRDP repository exploit CVE-2021-43174?
An RRDP repository can exploit CVE-2021-43174 by using the gzip transfer encoding to cause an out-of-memory crash in affected versions of NLnet Labs Routinator.
Is there a fix for CVE-2021-43174?
Yes, updating to NLnet Labs Routinator version 0.10.2 or later will fix CVE-2021-43174.
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- source/MITRE
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