CVE-2015-5244
First published: Wed Sep 02 2015(Updated: )
The NSSCipherSuite option of mod_nss accepts OpenSSL-styled cipherstrings. It was found that the parsing of such cipherstrings is flawed. If this option is used to disable insecure ciphersuites using the common "!" syntax, e.g.: NSSCipherSuite !eNULL:!aNULL:AESGCM+aRSA:ECDH+aRSA it will actually enable those insecure ciphersuites. Acknowledgements: This issue was discovered Hubert Kario of Red Hat.
Credit: secalert@redhat.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Mod Nss Project Mod Nss | <=1.0.11 |
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Reference Links
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1263070
- https://git.fedorahosted.org/cgit/mod_nss.git/commit/?id=34e1ccecb4a7d5054dba2f92b403af9b6ae1e110
- https://bugzilla.redhat.com/show_bug.cgi?id=1259216
- http://lists.fedoraproject.org/pipermail/package-announce/2016-January/175248.html
- http://lists.fedoraproject.org/pipermail/package-announce/2016-January/176026.html
- https://pagure.io/mod_nss/c/34e1ccecb4a7d5054dba2f92b403af9b6ae1e110
Frequently Asked Questions
What is the severity of CVE-2015-5244?
CVE-2015-5244 is considered a moderate severity vulnerability due to its potential impact on the security of TLS connections.
How do I fix CVE-2015-5244?
To mitigate CVE-2015-5244, upgrade mod_nss to version 1.0.12 or later, where the cipherstring parsing flaw has been addressed.
What systems are affected by CVE-2015-5244?
CVE-2015-5244 affects mod_nss versions up to and including 1.0.11.
Can CVE-2015-5244 be exploited remotely?
Yes, CVE-2015-5244 can be exploited remotely if the vulnerable version of mod_nss is used in an exposed web server configuration.
What types of attacks can CVE-2015-5244 facilitate?
CVE-2015-5244 could facilitate attacks that exploit improper cipher configuration, potentially allowing an attacker to downgrade or compromise encrypted connections.
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