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Gentoo Linux Security Advisory GLSA 202004-08 |
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https://security.gentoo.org/ |
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Severity: Low |
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Title: libssh: Denial of Service |
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Date: April 10, 2020 |
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Bugs: #716788 |
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ID: 202004-08 |
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Synopsis |
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======== |
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|
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A vulnerability in libssh could allow a remote attacker to cause a |
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Denial of Service condition. |
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Background |
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========== |
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|
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libssh is a multiplatform C library implementing the SSHv2 protocol on |
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client and server side. |
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Affected packages |
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================= |
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|
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------------------------------------------------------------------- |
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Package / Vulnerable / Unaffected |
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------------------------------------------------------------------- |
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1 net-libs/libssh < 0.9.4 >= 0.9.4 |
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Description |
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=========== |
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|
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It was discovered that libssh could crash when AES-CTR ciphers are |
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used. |
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Impact |
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====== |
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|
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A remote attacker running a malicious client or server could possibly |
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crash the counterpart implemented with libssh and cause a Denial of |
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Service condition. |
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Workaround |
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========== |
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Disable AES-CTR ciphers. If you implement a server using libssh it is |
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recommended to use a prefork model so each session runs in an own |
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process. |
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Resolution |
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========== |
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All libssh users should upgrade to the latest version: |
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# emerge --sync |
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# emerge --ask --oneshot --verbose ">=net-libs/libssh-0.9.4" |
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References |
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========== |
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[ 1 ] CVE-2020-1730 |
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https://nvd.nist.gov/vuln/detail/CVE-2020-1730 |
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Availability |
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============ |
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This GLSA and any updates to it are available for viewing at |
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the Gentoo Security Website: |
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https://security.gentoo.org/glsa/202004-08 |
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Concerns? |
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========= |
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Security is a primary focus of Gentoo Linux and ensuring the |
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confidentiality and security of our users' machines is of utmost |
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importance to us. Any security concerns should be addressed to |
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security@g.o or alternatively, you may file a bug at |
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https://bugs.gentoo.org. |
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License |
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======= |
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Copyright 2020 Gentoo Foundation, Inc; referenced text |
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belongs to its owner(s). |
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The contents of this document are licensed under the |
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Creative Commons - Attribution / Share Alike license. |
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https://creativecommons.org/licenses/by-sa/2.5 |
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