Synopsis

gnutls security update

Type/Severity

Security Advisory: Important

Topic

Updated gnutls packages that fix a security issue are now available for Red
Hat Enterprise Linux 4.

This update has been rated as having important security impact by the Red
Hat Security Response Team.

Description

The GnuTLS Library provides support for cryptographic algorithms and
protocols such as TLS. GnuTLS includes libtasn1, a library developed for
ASN.1 structures management that includes DER encoding and decoding.

Daniel Bleichenbacher recently described an attack on PKCS #1 v1.5
signatures. Where an RSA key with exponent 3 is used it may be possible for
an attacker to forge a PKCS #1 v1.5 signature that would be incorrectly
verified by implementations that do not check for excess data in the RSA
exponentiation result of the signature.

The core GnuTLS team discovered that GnuTLS is vulnerable to a variant of
the Bleichenbacker attack. This issue affects applications that use GnuTLS
to verify X.509 certificates as well as other uses of PKCS #1 v1.5.
(CVE-2006-4790)

In Red Hat Enterprise Linux 4, the GnuTLS library is only used by the
Evolution client when connecting to an Exchange server or when publishing
calendar information to a WebDAV server.

Users are advised to upgrade to these updated packages, which contain a
backported patch from the GnuTLS maintainers to correct this issue.

Solution

Before applying this update, make sure all previously released errata
relevant to your system have been applied.

This update is available via Red Hat Network. To use Red Hat Network,
launch the Red Hat Update Agent with the following command:

up2date

This will start an interactive process that will result in the appropriate
RPMs being upgraded on your system.

Affected Products

• Red Hat Enterprise Linux Server 4 x86_64
• Red Hat Enterprise Linux Server 4 ia64
• Red Hat Enterprise Linux Server 4 i386
• Red Hat Enterprise Linux Workstation 4 x86_64
• Red Hat Enterprise Linux Workstation 4 ia64
• Red Hat Enterprise Linux Workstation 4 i386
• Red Hat Enterprise Linux Desktop 4 x86_64
• Red Hat Enterprise Linux Desktop 4 i386
• Red Hat Enterprise Linux for IBM z Systems 4 s390x
• Red Hat Enterprise Linux for IBM z Systems 4 s390
• Red Hat Enterprise Linux for Power, big endian 4 ppc

Fixes

• BZ - 206411 - CVE-2006-4790 RSA forgery affects gnutls

CVEs

• CVE-2006-4790

References

• http://www.redhat.com/security/updates/classification/#important

Red Hat Enterprise Linux Server 4

SRPM
gnutls-1.0.20-3.2.3.src.rpm	SHA-256: 421b7091aa1be3861ccae49b4196fde17563c20a7e11801c43d64c9d7ec97c44
x86_64
gnutls-1.0.20-3.2.3.i386.rpm	SHA-256: 42db0fd369f63c273b8d0be2d42726f54389764e325b8681424974db90055b63
gnutls-1.0.20-3.2.3.i386.rpm	SHA-256: 42db0fd369f63c273b8d0be2d42726f54389764e325b8681424974db90055b63
gnutls-1.0.20-3.2.3.x86_64.rpm	SHA-256: 9fb0a8c6ee72b7c77b40178ef1f1aa60820399bef986768e8f68b9f0c7bcf06d
gnutls-1.0.20-3.2.3.x86_64.rpm	SHA-256: 9fb0a8c6ee72b7c77b40178ef1f1aa60820399bef986768e8f68b9f0c7bcf06d
gnutls-devel-1.0.20-3.2.3.x86_64.rpm	SHA-256: 2d587ca8f01405ec9b8e37f754b66ea5db9217a49f41844a4d68b558607295b1
gnutls-devel-1.0.20-3.2.3.x86_64.rpm	SHA-256: 2d587ca8f01405ec9b8e37f754b66ea5db9217a49f41844a4d68b558607295b1
ia64
gnutls-1.0.20-3.2.3.i386.rpm	SHA-256: 42db0fd369f63c273b8d0be2d42726f54389764e325b8681424974db90055b63
gnutls-1.0.20-3.2.3.i386.rpm	SHA-256: 42db0fd369f63c273b8d0be2d42726f54389764e325b8681424974db90055b63
gnutls-1.0.20-3.2.3.ia64.rpm	SHA-256: 6509a377ad89d946d29866e629f5e1b2373b17df0f6365cd8711165b2e1e1449
gnutls-1.0.20-3.2.3.ia64.rpm	SHA-256: 6509a377ad89d946d29866e629f5e1b2373b17df0f6365cd8711165b2e1e1449
gnutls-devel-1.0.20-3.2.3.ia64.rpm	SHA-256: 8b7a03b1495325327a99c75dfa628f8ae8a179b2eb1e25bde0e83515fbe9f1d1
gnutls-devel-1.0.20-3.2.3.ia64.rpm	SHA-256: 8b7a03b1495325327a99c75dfa628f8ae8a179b2eb1e25bde0e83515fbe9f1d1
i386
gnutls-1.0.20-3.2.3.i386.rpm	SHA-256: 42db0fd369f63c273b8d0be2d42726f54389764e325b8681424974db90055b63
gnutls-1.0.20-3.2.3.i386.rpm	SHA-256: 42db0fd369f63c273b8d0be2d42726f54389764e325b8681424974db90055b63
gnutls-devel-1.0.20-3.2.3.i386.rpm	SHA-256: 3fa7ee60f189d5d0f21dde6e156f713a63b21e15c26970c83b4b66154a29cba3
gnutls-devel-1.0.20-3.2.3.i386.rpm	SHA-256: 3fa7ee60f189d5d0f21dde6e156f713a63b21e15c26970c83b4b66154a29cba3

Red Hat Enterprise Linux Workstation 4

SRPM
gnutls-1.0.20-3.2.3.src.rpm	SHA-256: 421b7091aa1be3861ccae49b4196fde17563c20a7e11801c43d64c9d7ec97c44
x86_64
gnutls-1.0.20-3.2.3.i386.rpm	SHA-256: 42db0fd369f63c273b8d0be2d42726f54389764e325b8681424974db90055b63
gnutls-1.0.20-3.2.3.x86_64.rpm	SHA-256: 9fb0a8c6ee72b7c77b40178ef1f1aa60820399bef986768e8f68b9f0c7bcf06d
gnutls-devel-1.0.20-3.2.3.x86_64.rpm	SHA-256: 2d587ca8f01405ec9b8e37f754b66ea5db9217a49f41844a4d68b558607295b1
ia64
gnutls-1.0.20-3.2.3.i386.rpm	SHA-256: 42db0fd369f63c273b8d0be2d42726f54389764e325b8681424974db90055b63
gnutls-1.0.20-3.2.3.ia64.rpm	SHA-256: 6509a377ad89d946d29866e629f5e1b2373b17df0f6365cd8711165b2e1e1449
gnutls-devel-1.0.20-3.2.3.ia64.rpm	SHA-256: 8b7a03b1495325327a99c75dfa628f8ae8a179b2eb1e25bde0e83515fbe9f1d1
i386
gnutls-1.0.20-3.2.3.i386.rpm	SHA-256: 42db0fd369f63c273b8d0be2d42726f54389764e325b8681424974db90055b63
gnutls-devel-1.0.20-3.2.3.i386.rpm	SHA-256: 3fa7ee60f189d5d0f21dde6e156f713a63b21e15c26970c83b4b66154a29cba3

Red Hat Enterprise Linux Desktop 4

SRPM
gnutls-1.0.20-3.2.3.src.rpm	SHA-256: 421b7091aa1be3861ccae49b4196fde17563c20a7e11801c43d64c9d7ec97c44
x86_64
gnutls-1.0.20-3.2.3.i386.rpm	SHA-256: 42db0fd369f63c273b8d0be2d42726f54389764e325b8681424974db90055b63
gnutls-1.0.20-3.2.3.x86_64.rpm	SHA-256: 9fb0a8c6ee72b7c77b40178ef1f1aa60820399bef986768e8f68b9f0c7bcf06d
gnutls-devel-1.0.20-3.2.3.x86_64.rpm	SHA-256: 2d587ca8f01405ec9b8e37f754b66ea5db9217a49f41844a4d68b558607295b1
i386
gnutls-1.0.20-3.2.3.i386.rpm	SHA-256: 42db0fd369f63c273b8d0be2d42726f54389764e325b8681424974db90055b63
gnutls-devel-1.0.20-3.2.3.i386.rpm	SHA-256: 3fa7ee60f189d5d0f21dde6e156f713a63b21e15c26970c83b4b66154a29cba3

Red Hat Enterprise Linux for IBM z Systems 4

SRPM
gnutls-1.0.20-3.2.3.src.rpm	SHA-256: 421b7091aa1be3861ccae49b4196fde17563c20a7e11801c43d64c9d7ec97c44
s390x
gnutls-1.0.20-3.2.3.s390.rpm	SHA-256: a1430bac96a386934d07ce7f41be8773cf1372acd7d84d87c70f5d4f57daa5f3
gnutls-1.0.20-3.2.3.s390x.rpm	SHA-256: 0302db9e96b86c8592c707936d72e5be85968d0434e28596d12fb0bdeafb1056
gnutls-devel-1.0.20-3.2.3.s390x.rpm	SHA-256: b8ac0168ae320a28b3d6201f47d1a74c39062487c9fda67ec3890857f3d9716c
s390
gnutls-1.0.20-3.2.3.s390.rpm	SHA-256: a1430bac96a386934d07ce7f41be8773cf1372acd7d84d87c70f5d4f57daa5f3
gnutls-devel-1.0.20-3.2.3.s390.rpm	SHA-256: ef238ab63b5bccfa33b2f0853f2a99c56d3093feace6e2cd0cd72751a850f5a4

Red Hat Enterprise Linux for Power, big endian 4

SRPM
gnutls-1.0.20-3.2.3.src.rpm	SHA-256: 421b7091aa1be3861ccae49b4196fde17563c20a7e11801c43d64c9d7ec97c44
ppc
gnutls-1.0.20-3.2.3.ppc.rpm	SHA-256: 492d5fedef5e24cc57a8054977b381c4355b7f36f4991c0d6676b0cd8c29e3a6
gnutls-1.0.20-3.2.3.ppc64.rpm	SHA-256: f1a3f5cf0550f899870d5e29273aba0bafe311f9e0283fc94f9b43278139eb78
gnutls-devel-1.0.20-3.2.3.ppc.rpm	SHA-256: a88219a6d3f62cd05e95ed5caa12df650a62b51ee9978ab4fbb79d0417a46dd1