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 Topic: OpenSSL 1.0.0d and 0.9.8r. |
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nicklowe
Joined: 15 Apr 2007
Posts: 8
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 Posted: Wed 09 Feb '11 13:55 Post subject: OpenSSL 1.0.0d and 0.9.8r. |
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http://www.openssl.org/news/secadv_20110208.txt
| Quote: | OCSP stapling vulnerability in OpenSSL
======================================
Incorrectly formatted ClientHello handshake messages could cause OpenSSL
to parse past the end of the message.
This issue applies to the following versions:
1) OpenSSL 0.9.8h through 0.9.8q
2) OpenSSL 1.0.0 through 1.0.0c
The parsing function in question is already used on arbitary data so no
additional vulnerabilities are expected to be uncovered by this.
However, an attacker may be able to cause a crash (denial of service) by
triggering invalid memory accesses.
The results of the parse are only availible to the application using
OpenSSL so do not directly cause an information leak. However, some
applications may expose the contents of parsed OCSP extensions,
specifically an OCSP nonce extension. An attacker could use this to read
the contents of memory following the ClientHello.
Users of OpenSSL should update to the OpenSSL 1.0.0d (or 0.9.8r) release,
which contains a patch to correct this issue. If upgrading is not
immediately possible, the source code patch. |
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