Out-of-bounds Write Affecting libssh package, versions <0:0.9.6-3.el8
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Test your applications- Snyk ID SNYK-ORACLE8-LIBSSH-2832337
- published 18 May 2022
- disclosed 31 Aug 2021
Introduced: 31 Aug 2021
CVE-2021-3634 Open this link in a new tabHow to fix?
Upgrade Oracle:8 libssh to version 0:0.9.6-3.el8 or higher.
This issue was patched in ELSA-2022-2031.
NVD Description
Note: Versions mentioned in the description apply only to the upstream libssh package and not the libssh package as distributed by Oracle.
See How to fix? for Oracle:8 relevant fixed versions and status.
A flaw has been found in libssh in versions prior to 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.
References
- https://linux.oracle.com/cve/CVE-2021-3634.html
- https://linux.oracle.com/errata/ELSA-2022-2031.html
- https://bugzilla.redhat.com/show_bug.cgi?id=1978810
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/DRK67AJCWYYVAGF5SGAHNZXCX3PN3ZFP/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/JKYD3ZRAMDAQX3ZW6THHUF3GXN7FF6B4/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/SVWAAB2XMKEUMPMDALINKAA4U2QM4LNG/
- https://security.netapp.com/advisory/ntap-20211004-0003/
- https://www.debian.org/security/2021/dsa-4965
- https://www.oracle.com/security-alerts/cpujan2022.html
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/DRK67AJCWYYVAGF5SGAHNZXCX3PN3ZFP/
- 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/SVWAAB2XMKEUMPMDALINKAA4U2QM4LNG/
- https://security.gentoo.org/glsa/202312-05