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Tobias Frost pushed to branch master at <a href="https://salsa.debian.org/security-tracker-team/security-tracker">Debian Security Tracker / security-tracker</a>
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Commits:
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<strong style="font-weight: bold;"><a href="https://salsa.debian.org/security-tracker-team/security-tracker/-/commit/60062332c17f97333c483413f0240c2aa2b88e61">60062332</a></strong>
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<span> by Tobias Frost </span> <i> at 2023-05-21T15:56:01+02:00 </i>
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<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 0.875rem; color: #333238; position: relative; font-family: var(--default-mono-font, "Menlo"),"DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; word-break: break-all; word-wrap: break-word; background-color: #fbfafd; border-radius: 2px; margin: 0; padding: 8px 12px; border: 1px solid #dcdcde;'>CVE-2023-2283/libssh [buster] vulnerable code introduced later.
Vulnerablity is in function pki_verify_data_signature and explained in [1]
Commit that introduces vulnerable function:
https://git.libssh.org/projects/libssh.git/commit/?id=fd94465
Commit that starts using the function:
https://git.libssh.org/projects/libssh.git/commit/?id=db51fa1
git tag --contains fd94465 shows that this commit no earlier than 0.9.0 part of any release.
The implementation present in buster, 0.8.7, does not have the refactoring
and errors out correctly with return SSH_ERROR in the verify functiob pki_signature_verify
that will in a later version call the vulnearble pki_verify_data_signature().
[1] https://www.libssh.org/security/advisories/CVE-2023-2283.txt
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1 changed file:
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<a href="#4716ef5aa8f2742228ba3b3633215c8b808565e3">
data/CVE/list
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Changes:
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<li id="4716ef5aa8f2742228ba3b3633215c8b808565e3">
<a href="https://salsa.debian.org/security-tracker-team/security-tracker/-/commit/60062332c17f97333c483413f0240c2aa2b88e61#4716ef5aa8f2742228ba3b3633215c8b808565e3"><strong style="font-weight: bold;">data/CVE/list</strong></a>
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