MGASA-2021-0441

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Source
https://advisories.mageia.org/MGASA-2021-0441.html
Import Source
https://advisories.mageia.org/MGASA-2021-0441.json
JSON Data
https://api.osv.dev/v1/vulns/MGASA-2021-0441
Upstream
Published
2021-09-23T04:49:29Z
Modified
2026-04-16T04:43:47Z
Summary
Updated libssh packages fix security vulnerability
Details

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. (CVE-2021-3634)

References
Credits

Affected packages

Mageia:8 / libssh

Package

Name
libssh
Purl
pkg:rpm/mageia/libssh?arch=source&distro=mageia-8

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
0.9.6-1.mga8

Ecosystem specific 

{
    "section": "core"
}

Database specific

source 
"https://advisories.mageia.org/MGASA-2021-0441.json"