CVE-2013-4623: Input Validation
First published: Fri Aug 16 2013(Updated: )
From the PolarSSL Security Advisory 2013-03 advisory: "A bug in the logic of the parsing of PEM encoded certificates in x509parse_crt() can result in an infinite loop, thus hogging processing power." A remote attacker could use this flaw to make a TLS/SSL server using PolarSSL consume an excessive amount of CPU. This issue was corrected in PolarSSL versions 1.1.7 and 1.2.8. (Versions prior to these are affected.) External References: <a href="https://polarssl.org/tech-updates/security-advisories/polarssl-security-advisory-2013-03">https://polarssl.org/tech-updates/security-advisories/polarssl-security-advisory-2013-03</a>
Credit: cve@mitre.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| PolarSSL | =1.1.0 | |
| PolarSSL | =1.1.0-rc0 | |
| PolarSSL | =1.1.0-rc1 | |
| PolarSSL | =1.1.1 | |
| PolarSSL | =1.1.2 | |
| PolarSSL | =1.1.3 | |
| PolarSSL | =1.1.4 | |
| PolarSSL | =1.1.5 | |
| PolarSSL | =1.1.6 | |
| PolarSSL | =1.2.0 | |
| PolarSSL | =1.2.1 | |
| PolarSSL | =1.2.2 | |
| PolarSSL | =1.2.3 | |
| PolarSSL | =1.2.4 | |
| PolarSSL | =1.2.5 | |
| PolarSSL | =1.2.6 | |
| PolarSSL | =1.2.7 |
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Reference Links
- https://polarssl.org/tech-updates/security-advisories/polarssl-security-advisory-2013-03
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=997770
- https://github.com/polarssl/polarssl/commit/1922a4e6aade7b1d685af19d4d9339ddb5c02859
- https://bugzilla.redhat.com/show_bug.cgi?id=997767
- http://lists.fedoraproject.org/pipermail/package-announce/2013-September/115922.html
- http://lists.fedoraproject.org/pipermail/package-announce/2013-September/115927.html
- http://lists.fedoraproject.org/pipermail/package-announce/2013-September/116351.html
- http://www.debian.org/security/2013/dsa-2782
- http://www.securityfocus.com/bid/61764
Frequently Asked Questions
What is the severity of CVE-2013-4623?
CVE-2013-4623 has a severity rating that indicates it can lead to denial of service due to infinite looping during certificate parsing.
How do I fix CVE-2013-4623?
To fix CVE-2013-4623, upgrade PolarSSL to a version that has addressed the infinite loop bug in x509parse_crt() functionality.
Which PolarSSL versions are affected by CVE-2013-4623?
CVE-2013-4623 affects PolarSSL versions 1.1.0 through 1.2.7 across various release candidates and regular releases.
Can CVE-2013-4623 be exploited remotely?
Yes, CVE-2013-4623 can be exploited by a remote attacker to cause a TLS/SSL server using PolarSSL to consume excessive processing power.
Is there a workaround for CVE-2013-4623?
Currently, the recommended action for CVE-2013-4623 is to update to a patched version of PolarSSL, as no effective workaround exists.
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- version/polarssl/1.1.0-rc0
- version/polarssl/1.1.0-rc1
- version/polarssl/1.1.1
- version/polarssl/1.1.2
- version/polarssl/1.1.3
- version/polarssl/1.1.4
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- version/polarssl/1.1.6
- version/polarssl/1.2.0
- version/polarssl/1.2.1
- version/polarssl/1.2.2
- version/polarssl/1.2.3
- version/polarssl/1.2.4
- version/polarssl/1.2.5
- version/polarssl/1.2.6
- version/polarssl/1.2.7