References to Advisories, Solutions, and Tools

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Change History

libssh2 through 1.11.1 grows its publickey list with SSH2_REALLOC but does not zero-initialize new entries before parsing populates them, so a parse failure reaching the cleanup path leaves libssh2_publickey_list_free operating on an uninitialized entry. A malicious SSH server offering the publickey subsystem can use a malformed response to make cleanup free an uninitialized, attacker-influenceable attrs pointer in a connecting libssh2 client.

AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:H

CWE-908

https://github.com/bikini/exploitarium/tree/main/libssh2-publickey-list-calc-poc

https://github.com/libssh2/libssh2/blob/master/src/publickey.c

https://www.vulncheck.com/advisories/libssh2-free-of-uninitialized-pointer-in-publickey-list-cleanup

[{"vendor":"libssh2","product":"libssh2","defaultStatus":"affected","versions":[{"version":"0","lessThanOrEqual":"1.11.1","versionType":"semver","status":"affected"}]}]