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CVE-2009-3555 TLS: MITM attacks via session renegotiation
CVE-2010-0731 gnutls: gnutls_x509_crt_get_serial incorrect serial
decoding from ASN1 (BE64) [GNUTLS-SA-2010-1]
A flaw was found in the way the TLS/SSL (Transport Layer
Security/Secure Sockets Layer) protocols handled session
renegotiation. A man-in-the-middle attacker could use this flaw to
prefix arbitrary plain text to a client's session (for example, an
HTTPS connection to a website). This could force the server to process
an attacker's request as if authenticated using the victim's
credentials. This update addresses this flaw by implementing the TLS
Renegotiation Indication Extension, as defined in RFC 5746.
Refer to the following Knowledgebase article for additional details
about the CVE-2009-3555 flaw:
Dan Kaminsky found that browsers could accept certificates with MD2
hash signatures, even though MD2 is no longer considered a
cryptographically strong algorithm. This could make it easier for an
attacker to create a malicious certificate that would be treated as
trusted by a browser. GnuTLS now disables the use of the MD2 algorithm
inside signatures by default. (CVE-2009-2409) SL5 Only
A flaw was found in the way GnuTLS extracted serial numbers from X.509
certificates. On 64-bit big endian platforms, this flaw could cause
the certificate revocation list (CRL) check to be bypassed
various GnuTLS utilities to crash
or, possibly, execute arbitrary
code. (CVE-2010-0731) SL4 Only
For the update to take effect, all applications linked to the GnuTLS
library must be restarted, or the system rebooted.
See also :
Update the affected gnutls, gnutls-devel and / or gnutls-utils
Risk factor :
High / CVSS Base Score : 7.5
Family: Scientific Linux Local Security Checks
Nessus Plugin ID: 60752 ()
CVE ID: CVE-2009-2409CVE-2009-3555CVE-2010-0731
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