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Opera: RSA signature forgery


1.  Gentoo Linux Security Advisory

Version Information

Advisory Reference GLSA 200609-18 / opera
Release Date September 28, 2006
Latest Revision September 28, 2006: 02
Impact normal
Exploitable remote
Package Vulnerable versions Unaffected versions Architecture(s)
www-client/opera < 9.02 >= 9.02 All supported architectures

Related bugreports: #147838


Opera fails to correctly verify certain signatures.

2.  Impact Information


Opera is a multi-platform web browser.


Opera makes use of OpenSSL, which fails to correctly verify PKCS #1 v1.5 RSA signatures signed by a key with exponent 3. Some CAs in Opera's list of trusted signers are using root certificates with exponent 3.


An attacker could forge certificates which will appear valid and signed by a trusted CA.

3.  Resolution Information


There is no known workaround at this time.


All Opera users should upgrade to the latest version:

Code Listing 3.1: Resolution

# emerge --sync
# emerge --ask --oneshot --verbose ">=www-client/opera-9.02"

4.  References


Page updated September 28, 2006

Summary: This is a Gentoo Linux Security Advisory

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