libssh2: CVE-2019-13115

Debian Bug report logs - #932329
libssh4: CVE-2019-13115

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Message #5 received at submit@bugs.debian.org (full text, mbox, reply):

From: Salvatore Bonaccorso <carnil@debian.org>

To: Debian Bug Tracking System <submit@bugs.debian.org>

Subject: libssh4: CVE-2019-13115

Date: Wed, 17 Jul 2019 21:20:12 +0200

Source: libssh4
Version: 1.8.0-2.1
Severity: important
Tags: security upstream

Hi,

The following vulnerability was published for libssh4.

CVE-2019-13115[0]:
| In libssh4 before 1.9.0,
| kex_method_diffie_hellman_group_exchange_sha256_key_exchange in kex.c
| has an integer overflow that could lead to an out-of-bounds write in
| the way packets are read from the server. A remote attacker who
| compromises a SSH server may be able to execute code on the client
| system when a user connects to the server. This is related to an
| _libssh4_check_length mistake, and is different from the various
| issues fixed in 1.8.1, such as CVE-2019-3855.

TTBOMK, and following [1] the issue is not just only introduced later
than 1.8.2, but is present before and was fixed upstream in various
commits around the _libssh4_check_length function and included all in
1.9.0. But the issue would be present before the introduction of the
_libssh4_check_length. Please double check.

If you fix the vulnerability please also make sure to include the
CVE (Common Vulnerabilities & Exposures) id in your changelog entry.

For further information see:

[0] https://security-tracker.debian.org/tracker/CVE-2019-13115
    https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-13115
[1] https://blog.semmle.com/libssh4-integer-overflow/

Please adjust the affected versions in the BTS as needed.

Regards,
Salvatore

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