Wan-Teh Chang wrote:
POC wrote:

Does the following vulnerability with ASN1, noted in some versions of
openSSL, also affect NSS?

http://www.cert.org/advisories/CA-2003-26.html


The NISCC TLS/SSL and S/MIME test suites uncovered
several vulnerabilities in NSS.  All of the
vulnerabilities found during our NISCC testing
have been fixed in NSS 3.9. We recommend that all
NSS customers upgrade to NSS 3.9 in the next
release of your product

I'd like to add a few more comments, speaking unofficially, of course.


1. OpenSSL and NSS are separately developed software, so none of the
specific vulnerabilities of one directly affect the other.  However,
it is possible that the two products coincidentally had vulnerabilities
to similar sorts of attacks.

2. The types of vulnerabilities that were found in NSS would cause
denial of service, through crashes or memory leaks.  I didn't find
any stack buffer overflows of the sort that allow attackers to run
their own code.

3. If I'm not mistaken, NSS 3.9 *should* be a "drop in" replacement for
NSS 3.7 and later, so it should be possible to simply install the NSS 3.9
shared libraries over the older ones in existing products.  No need to
wait for a new product release to use the new NSS.  (Be sure to backup
your old software and NSS databases first though. Your mileage may vary.)

For example, I've installed NSS 3.9 DLLs into a mozilla 1.3.1 installation
and it works just fine.

--
Nelson B

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