Published: 31/08/2021 Updated: 22/12/2023

CVSS v2 Base Score: 4 | Impact Score: 2.9 | Exploitability Score: 8

CVSS v3 Base Score: 6.5 | Impact Score: 3.6 | Exploitability Score: 2.8

VMScore: 356

Vector: AV:N/AC:L/Au:S/C:N/I:N/A:P

A flaw has been found in libssh in versions before 0.9.6. The SSH protocol keeps track of two shared secrets during the lifetime of the session. One of them is called secret_hash and the other session_id. Initially, both of them are the same, but after key re-exchange, previous session_id is kept and used as an input to new secret_hash. Historically, both of these buffers had shared length variable, which worked as long as these buffers were same. But the key re-exchange operation can also change the key exchange method, which can be based on hash of different size, eventually creating "secret_hash" of different size than the session_id has. This becomes an issue when the session_id memory is zeroed or when it is used again during second key re-exchange.

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libssh libssh
redhat virtualization 4.0
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Debian Bug report logs - #993046 libssh: CVE-2021-3634 Package: src:libssh; Maintainer for src:libssh is Laurent Bigonville <bigon@debianorg>; Reported by: Salvatore Bonaccorso <carnil@debianorg> Date: Thu, 26 Aug 2021 20:24:01 UTC Severity: important Tags: security, upstream Found in version libssh/095-1 R ...

It was discovered that a buffer overflow in rekeying in libssh could result in denial of service or potentially the execution of arbitrary code The oldstable distribution (buster) is not affected For the stable distribution (bullseye), this problem has been fixed in version 095-1+deb11u1 We recommend that you upgrade your libssh packages For ...

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A security issue has been found in libssh before version 096 An attacker can request a rekey with a key exchange algorithm with a digest of a different size, causing libssh reading or writing behind the buffer limits ...

CWE-787 https://bugzilla.redhat.com/show_bug.cgi?id=1978810 https://www.debian.org/security/2021/dsa-4965 https://security.netapp.com/advisory/ntap-20211004-0003/https://www.oracle.com/security-alerts/cpujan2022.html https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/SVWAAB2XMKEUMPMDALINKAA4U2QM4LNG/https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JKYD3ZRAMDAQX3ZW6THHUF3GXN7FF6B4/https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/DRK67AJCWYYVAGF5SGAHNZXCX3PN3ZFP/https://security.gentoo.org/glsa/202312-05 https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=993046 https://nvd.nist.gov https://www.debian.org/security/2021/dsa-4965

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CVE-2021-3634

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