drucken bookmarks versenden konfigurieren admin pdf Sicherheit: Mehrere Probleme in libssh und libssh2
Name: |
Mehrere Probleme in libssh und libssh2 |
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ID: |
201606-12 |
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Distribution: |
Gentoo |
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Plattformen: |
Keine Angabe |
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Datum: |
So, 26. Juni 2016, 16:46 |
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Referenzen: |
http://nvd.nist.gov/nvd.cfm?cvename=CVE-2016-0739
http://nvd.nist.gov/nvd.cfm?cvename=CVE-2014-8132
http://nvd.nist.gov/nvd.cfm?cvename=CVE-2016-0787 |
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Applikationen: |
libssh, libssh2 |
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Originalnachricht |
This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --JREjtTevJGIRgj5XX6TkMmxldI1wJnOvH Content-Type: multipart/mixed; boundary="QEKrRc01ws22wLmB4J9JHQmvPpEtom5be" From: Aaron Bauman <bman@gentoo.org> To: gentoo-announce@lists.gentoo.org Message-ID: <6ca687e6-b0ad-fb9b-3c29-6945346f890f@gentoo.org> Subject: [ GLSA 201606-12 ] libssh and libssh2: Multiple vulnerabilities
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This is a multi-part message in MIME format. --------------5AFBC32E154056ABD7990ABF Content-Type: text/plain; charset=utf- Content-Transfer-Encoding: quoted-printable
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Gentoo Linux Security Advisory GLSA 201606-12 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - https://security.gentoo.org/ - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Severity: Normal Title: libssh and libssh2: Multiple vulnerabilities Date: June 26, 2016 Bugs: #533366, #575474, #575484 ID: 201606-12
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Synopsis ========
Multiple vulnerabilities have been found in libssh and libssh2, the worst of which allows remote attackers to cause Denial of Service.
Background ==========
libssh is a mulitplatform C library implementing the SSHv2 and SSHv1 protocol on client and server side.
Affected packages =================
------------------------------------------------------------------- Package / Vulnerable / Unaffected ------------------------------------------------------------------- 1 net-libs/libssh < 0.7.3 >= 0.7.3 2 net-libs/libssh2 < 1.7.0 >= 1.7.0 ------------------------------------------------------------------- 2 affected packages
Description ===========
libssh and libssh2 both have a bits/bytes confusion bug and generate an abnormaly short ephemeral secret for the diffie-hellman-group1 and diffie-hellman-group14 key exchange methods. The resulting secret is 128 bits long, instead of the recommended sizes of 1024 and 2048 bits respectively.
Additionally, a double free on dangling pointers in initial key exchange packets within libssh could leave dangling pointers in the session crypto structures. It is possible to send a malicious kexinit package to eventually cause a server to do a double-free before this fix. This could be used for a Denial of Service attack.
Impact ======
Remote attackers may gain access to confidential information due to the short keysize generated by libssh and libssh2, or cause a Denial of Service condition.
Workaround ==========
There is no known workaround at this time.
Resolution ==========
All libssh users should upgrade to the latest version:
# emerge --sync # emerge --ask --oneshot --verbose ">=net-libs/libssh-0.7.3"
All libssh2 users should upgrade to the latest version:
# emerge --sync # emerge --ask --oneshot --verbose ">=net-libs/libssh2-1.7.0"
References ==========
[ 1 ] CVE-2014-8132 http://nvd.nist.gov/nvd.cfm?cvename=CVE-2014-8132 [ 2 ] CVE-2016-0739 http://nvd.nist.gov/nvd.cfm?cvename=CVE-2016-0739 [ 3 ] CVE-2016-0787 http://nvd.nist.gov/nvd.cfm?cvename=CVE-2016-0787
Availability ============
This GLSA and any updates to it are available for viewing at the Gentoo Security Website:
https://security.gentoo.org/glsa/201606-12
Concerns? =========
Security is a primary focus of Gentoo Linux and ensuring the confidentiality and security of our users' machines is of utmost importance to us. Any security concerns should be addressed to security@gentoo.org or alternatively, you may file a bug at https://bugs.gentoo.org.
License =======
Copyright 2016 Gentoo Foundation, Inc; referenced text belongs to its owner(s).
The contents of this document are licensed under the Creative Commons - Attribution / Share Alike license.
http://creativecommons.org/licenses/by-sa/2.5
--------------5AFBC32E154056ABD7990ABF Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: quoted-printable
<html> <head>
<meta http-equiv=3D"Content-Type" content=3D"text/html; charset=3Dutf= -8"> </head> <body bgcolor=3D"#FFFFFF" text=3D"#000000"> <p> <meta http-equiv=3D"Content-Type" content=3D"text/html; charset=3Du= tf-8"> </p> <pre style=3D"color: rgb(0, 0, 0); font-style: normal; font-variant: = normal; font-weight: normal; letter-spacing: normal; line-height: normal;= orphans: auto; text-align: start; text-indent: 0px; text-transform: none= ; widows: 1; word-spacing: 0px; -webkit-text-stroke-width: 0px; word-wrap= : break-word; white-space: pre-wrap;">- - - - - - - - - - - - - - - - - -= - - - - - - - - - - - - - - - - - - Gentoo Linux Security Advisory GLSA 201606-12 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - <a class=3D"moz-txt-link-freet= ext" href=3D"https://security.gentoo.org/">https://security.gentoo.org/</= a> - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Severity: Normal Title: libssh and libssh2: Multiple vulnerabilities Date: June 26, 2016 Bugs: #533366, #575474, #575484 ID: 201606-12
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Synopsis =3D=3D=3D=3D=3D=3D=3D=3D
Multiple vulnerabilities have been found in libssh and libssh2, the worst of which allows remote attackers to cause Denial of Service.
Background =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
libssh is a mulitplatform C library implementing the SSHv2 and SSHv1 protocol on client and server side.
Affected packages =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
------------------------------------------------------------------- Package / Vulnerable / Unaffected ------------------------------------------------------------------- 1 net-libs/libssh < 0.7.3 >=3D 0= =2E7.3=20 2 net-libs/libssh2 < 1.7.0 >=3D 1= =2E7.0=20 ------------------------------------------------------------------- 2 affected packages
Description =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
libssh and libssh2 both have a bits/bytes confusion bug and generate an abnormaly short ephemeral secret for the diffie-hellman-group1 and diffie-hellman-group14 key exchange methods. The resulting secret is 128 bits long, instead of the recommended sizes of 1024 and 2048 bits respectively.
Additionally, a double free on dangling pointers in initial key exchange packets within libssh could leave dangling pointers in the session crypto structures. It is possible to send a malicious kexinit package to eventually cause a server to do a double-free before this fix. This could be used for a Denial of Service attack.
Impact =3D=3D=3D=3D=3D=3D
Remote attackers may gain access to confidential information due to the short keysize generated by libssh and libssh2, or cause a Denial of Service condition.
Workaround =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
There is no known workaround at this time.
Resolution =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
All libssh users should upgrade to the latest version:
# emerge --sync # emerge --ask --oneshot --verbose ">=3Dnet-libs/libssh-0.7.3"
All libssh2 users should upgrade to the latest version:
# emerge --sync # emerge --ask --oneshot --verbose ">=3Dnet-libs/libssh2-1.7.0"
References =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
[ 1 ] CVE-2014-8132 <a class=3D"moz-txt-link-freetext" href=3D"http://nvd.nist.gov/nvd.= cfm?cvename=3DCVE-2014-8132">http://nvd.nist.gov/nvd.cfm?cvename=3DCVE-20= 14-8132</a> [ 2 ] CVE-2016-0739 <a class=3D"moz-txt-link-freetext" href=3D"http://nvd.nist.gov/nvd.= cfm?cvename=3DCVE-2016-0739">http://nvd.nist.gov/nvd.cfm?cvename=3DCVE-20= 16-0739</a> [ 3 ] CVE-2016-0787 <a class=3D"moz-txt-link-freetext" href=3D"http://nvd.nist.gov/nvd.= cfm?cvename=3DCVE-2016-0787">http://nvd.nist.gov/nvd.cfm?cvename=3DCVE-20= 16-0787</a>
Availability =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
This GLSA and any updates to it are available for viewing at the Gentoo Security Website:
<a class=3D"moz-txt-link-freetext" href=3D"https://security.gentoo.org/g= lsa/201606-12">https://security.gentoo.org/glsa/201606-12</a>
Concerns? =3D=3D=3D=3D=3D=3D=3D=3D=3D
Security is a primary focus of Gentoo Linux and ensuring the confidentiality and security of our users' machines is of utmost importance to us. Any security concerns should be addressed to <a class=3D"moz-txt-link-abbreviated" href=3D"mailto:security@gentoo.org"= >security@gentoo.org</a> or alternatively, you may file a bug at <a class=3D"moz-txt-link-freetext" href=3D"https://bugs.gentoo.org">https= ://bugs.gentoo.org</a>.
License =3D=3D=3D=3D=3D=3D=3D
Copyright 2016 Gentoo Foundation, Inc; referenced text belongs to its owner(s).
The contents of this document are licensed under the Creative Commons - Attribution / Share Alike license.
<a class=3D"moz-txt-link-freetext" href=3D"http://creativecommons.org/lic= enses/by-sa/2.5">http://creativecommons.org/licenses/by-sa/2.5</a></pre> </body> </html>
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