FreeBSD VuXML: Documenting security issues in FreeBSD and the FreeBSD Ports Collection

openssl -- potential SSL 2.0 rollback

Affected packages
openssl <= 0.9.7g
0.9.8 <= openssl <= 0.9.8_1
0.9.*_20050325 <= openssl <= 0.9.*_20051011
openssl-overwrite-base <= 0.9.7g
0.9.8 <= openssl-overwrite-base <= 0.9.8_1
0.9.*_20050325 <= openssl-overwrite-base <= 0.9.*_20051011
openssl-beta <= 0.9.8_1
0.9.*_20050325 <= openssl-beta <= 0.9.*_20051011
openssl-beta-overwrite-base <= 0.9.8_1
0.9.*_20050325 <= openssl-beta-overwrite-base <= 0.9.*_20051011
compat5x-alpha < 5.4.0.8
compat5x-amd64 < 5.4.0.8
compat5x-i386 < 5.4.0.8
compat5x-sparc64 < 5.4.0.8
Affected systems
FreeBSD < 4.10_19
4.11 <= FreeBSD < 4.11_13
5.3 <= FreeBSD < 5.3_23
5.4 <= FreeBSD < 5.4_8

Details

VuXML ID 60e26a40-3b25-11da-9484-00123ffe8333
Discovery 2005-10-11
Entry 2005-10-12
Modified 2005-10-25

Vulnerability:

Such applications are affected if they use the option SSL_OP_MSIE_SSLV2_RSA_PADDING. This option is implied by use of SSL_OP_ALL, which is intended to work around various bugs in third-party software that might prevent interoperability. The SSL_OP_MSIE_SSLV2_RSA_PADDING option disables a verification step in the SSL 2.0 server supposed to prevent active protocol-version rollback attacks. With this verification step disabled, an attacker acting as a "man in the middle" can force a client and a server to negotiate the SSL 2.0 protocol even if these parties both support SSL 3.0 or TLS 1.0. The SSL 2.0 protocol is known to have severe cryptographic weaknesses and is supported as a fallback only.

Applications using neither SSL_OP_MSIE_SSLV2_RSA_PADDING nor SSL_OP_ALL are not affected. Also, applications that disable use of SSL 2.0 are not affected.

References

CVE Name CVE-2005-2969
FreeBSD Advisory SA-05:21.openssl
URL http://www.openssl.org/news/secadv_20051011.txt