var-202004-2205
Vulnerability from variot
Server or client applications that call the SSL_check_chain() function during or after a TLS 1.3 handshake may crash due to a NULL pointer dereference as a result of incorrect handling of the "signature_algorithms_cert" TLS extension. The crash occurs if an invalid or unrecognised signature algorithm is received from the peer. This could be exploited by a malicious peer in a Denial of Service attack. OpenSSL version 1.1.1d, 1.1.1e, and 1.1.1f are affected by this issue. This issue did not affect OpenSSL versions prior to 1.1.1d. Fixed in OpenSSL 1.1.1g (Affected 1.1.1d-1.1.1f). OpenSSL for, NULL Pointer reference vulnerability (CWE-476) exists. OpenSSL Project Than, OpenSSL Security Advisory [21 April 2020] Has been published. Severity - high (Severity: HIGH)SSL_check_chain Segmentation violation in function - CVE-2020-1967TLS 1.3 of signature_algorithms_cert When processing extensions NULL Because pointer reference occurs, communication after handshake SSL_check_chain() The server or client application may crash when the function is executed.Denial of service by receiving a specially crafted message by a remote third party (DoS) You may be attacked. The product supports a variety of encryption algorithms, including symmetric ciphers, hash algorithms, secure hash algorithms, etc. A remote attacker could exploit this vulnerability to crash the server or client application. - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Gentoo Linux Security Advisory GLSA 202004-10
https://security.gentoo.org/
Severity: Normal Title: OpenSSL: Multiple vulnerabilities Date: April 23, 2020 Bugs: #702176, #717442 ID: 202004-10
Synopsis
Multiple vulnerabilities were found in OpenSSL, the worst of which could allow remote attackers to cause a Denial of Service condition.
Background
OpenSSL is an Open Source toolkit implementing the Secure Sockets Layer (SSL v2/v3) and Transport Layer Security (TLS v1/v1.1/v1.2/v1.3) as well as a general purpose cryptography library.
Affected packages
-------------------------------------------------------------------
Package / Vulnerable / Unaffected
-------------------------------------------------------------------
1 dev-libs/openssl < 1.1.1g >= 1.1.1g
Description
Multiple vulnerabilities have been discovered in OpenSSL. Please review the CVE identifiers referenced below for details.
Impact
A remote attacker could perform a malicious crafted TLS 1.3 handshake against an application using OpenSSL, possibly resulting in a Denial of Service condition.
In addition, it's feasible that an attacker might attack DH512.
Workaround
There is no known workaround at this time.
Resolution
All OpenSSL users should upgrade to the latest version:
# emerge --sync # emerge --ask --oneshot --verbose ">=dev-libs/openssl-1.1.1g"
References
[ 1 ] CVE-2019-1551 https://nvd.nist.gov/vuln/detail/CVE-2019-1551 [ 2 ] CVE-2020-1967 https://nvd.nist.gov/vuln/detail/CVE-2020-1967
Availability
This GLSA and any updates to it are available for viewing at the Gentoo Security Website:
https://security.gentoo.org/glsa/202004-10
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 2020 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.
https://creativecommons.org/licenses/by-sa/2.5
.
The oldstable distribution (stretch) is not affected.
For the stable distribution (buster), this problem has been fixed in version 1.1.1d-0+deb10u3.
For the detailed security status of openssl please refer to its security tracker page at: https://security-tracker.debian.org/tracker/openssl
Further information about Debian Security Advisories, how to apply these updates to your system and frequently asked questions can be found at: https://www.debian.org/security/
Mailing list: debian-security-announce@lists.debian.org -----BEGIN PGP SIGNATURE-----
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This issue did not affect OpenSSL 1.1.0 however these versions are out of support and no longer receiving updates.
References
URL for this Security Advisory: https://www.openssl.org/news/secadv/20200421.txt
Note: the online version of the advisory may be updated with additional details over time.
For details of OpenSSL severity classifications please see: https://www.openssl.org/policies/secpolicy.html
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"data": "Server or client applications that call the SSL_check_chain() function during or after a TLS 1.3 handshake may crash due to a NULL pointer dereference as a result of incorrect handling of the \"signature_algorithms_cert\" TLS extension. The crash occurs if an invalid or unrecognised signature algorithm is received from the peer. This could be exploited by a malicious peer in a Denial of Service attack. OpenSSL version 1.1.1d, 1.1.1e, and 1.1.1f are affected by this issue. This issue did not affect OpenSSL versions prior to 1.1.1d. Fixed in OpenSSL 1.1.1g (Affected 1.1.1d-1.1.1f). OpenSSL for, NULL Pointer reference vulnerability (CWE-476) exists. OpenSSL Project Than, OpenSSL Security Advisory [21 April 2020] Has been published. Severity - high (Severity: HIGH)SSL_check_chain Segmentation violation in function - CVE-2020-1967TLS 1.3 of signature_algorithms_cert When processing extensions NULL Because pointer reference occurs, communication after handshake SSL_check_chain() The server or client application may crash when the function is executed.Denial of service by receiving a specially crafted message by a remote third party (DoS) You may be attacked. The product supports a variety of encryption algorithms, including symmetric ciphers, hash algorithms, secure hash algorithms, etc. A remote attacker could exploit this vulnerability to crash the server or client application. - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -\nGentoo Linux Security Advisory GLSA 202004-10\n- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -\n https://security.gentoo.org/\n- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -\n\n Severity: Normal\n Title: OpenSSL: Multiple vulnerabilities\n Date: April 23, 2020\n Bugs: #702176, #717442\n ID: 202004-10\n\n- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -\n\nSynopsis\n========\n\nMultiple vulnerabilities were found in OpenSSL, the worst of which\ncould allow remote attackers to cause a Denial of Service condition. \n\nBackground\n==========\n\nOpenSSL is an Open Source toolkit implementing the Secure Sockets Layer\n(SSL v2/v3) and Transport Layer Security (TLS v1/v1.1/v1.2/v1.3) as\nwell as a general purpose cryptography library. \n\nAffected packages\n=================\n\n -------------------------------------------------------------------\n Package / Vulnerable / Unaffected\n -------------------------------------------------------------------\n 1 dev-libs/openssl \u003c 1.1.1g \u003e= 1.1.1g\n\nDescription\n===========\n\nMultiple vulnerabilities have been discovered in OpenSSL. Please review\nthe CVE identifiers referenced below for details. \n\nImpact\n======\n\nA remote attacker could perform a malicious crafted TLS 1.3 handshake\nagainst an application using OpenSSL, possibly resulting in a Denial of\nService condition. \n\nIn addition, it\u0027s feasible that an attacker might attack DH512. \n\nWorkaround\n==========\n\nThere is no known workaround at this time. \n\nResolution\n==========\n\nAll OpenSSL users should upgrade to the latest version:\n\n # emerge --sync\n # emerge --ask --oneshot --verbose \"\u003e=dev-libs/openssl-1.1.1g\"\n\nReferences\n==========\n\n[ 1 ] CVE-2019-1551\n https://nvd.nist.gov/vuln/detail/CVE-2019-1551\n[ 2 ] CVE-2020-1967\n https://nvd.nist.gov/vuln/detail/CVE-2020-1967\n\nAvailability\n============\n\nThis GLSA and any updates to it are available for viewing at\nthe Gentoo Security Website:\n\n https://security.gentoo.org/glsa/202004-10\n\nConcerns?\n=========\n\nSecurity is a primary focus of Gentoo Linux and ensuring the\nconfidentiality and security of our users\u0027 machines is of utmost\nimportance to us. Any security concerns should be addressed to\nsecurity@gentoo.org or alternatively, you may file a bug at\nhttps://bugs.gentoo.org. \n\nLicense\n=======\n\nCopyright 2020 Gentoo Foundation, Inc; referenced text\nbelongs to its owner(s). \n\nThe contents of this document are licensed under the\nCreative Commons - Attribution / Share Alike license. \n\nhttps://creativecommons.org/licenses/by-sa/2.5\n\n. \n\nThe oldstable distribution (stretch) is not affected. \n\nFor the stable distribution (buster), this problem has been fixed in\nversion 1.1.1d-0+deb10u3. \n\nFor the detailed security status of openssl please refer to\nits security tracker page at:\nhttps://security-tracker.debian.org/tracker/openssl\n\nFurther information about Debian Security Advisories, how to apply\nthese updates to your system and frequently asked questions can be\nfound at: https://www.debian.org/security/\n\nMailing list: debian-security-announce@lists.debian.org\n-----BEGIN PGP SIGNATURE-----\n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\nJzfXM799tz16MrKVinXPsIAfZTrr6nbrxYuyDwQ4X7iFdJZ6T3g=\n=RykD\n-----END PGP SIGNATURE-----\n. It was found using the new static analysis pass being implemented in GCC,\n-fanalyzer. Additional analysis was performed by Matt Caswell and Benjamin\nKaduk. Extended support is available\nfor premium support customers: https://www.openssl.org/support/contracts.html\n\nThis issue did not affect OpenSSL 1.1.0 however these versions are out of\nsupport and no longer receiving updates. \n\nReferences\n==========\n\nURL for this Security Advisory:\nhttps://www.openssl.org/news/secadv/20200421.txt\n\nNote: the online version of the advisory may be updated with additional details\nover time. \n\nFor details of OpenSSL severity classifications please see:\nhttps://www.openssl.org/policies/secpolicy.html\n",
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