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AUSCERT External Security Bulletin Redistribution
ESB-2019.2795.2
[SECURITY] [DLA 1730-3] libssh2 regression update
31 July 2019
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AusCERT Security Bulletin Summary
---------------------------------
Product: libssh2
Publisher: Debian
Operating System: Debian GNU/Linux 8
Impact/Access: Access Privileged Data -- Remote with User Interaction
Denial of Service -- Remote with User Interaction
Resolution: Patch/Upgrade
CVE Names: CVE-2019-13115 CVE-2019-3859
Reference: ESB-2019.1447
ESB-2019.1301
ESB-2019.1274
ESB-2019.1110
Original Bulletin:
https://lists.debian.org/debian-lts-announce/2019/07/msg00024.html
Comment: This bulletin contains two (2) Debian security advisories.
Revision History: July 31 2019: Regression fix added
July 26 2019: Initial Release
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Package : libssh2
Version : 1.4.3-4.1+deb8u4
CVE ID : CVE-2019-3859 CVE-2019-13115
Various security problems have been additionally fixed in libssh2, an SSH
client implementation written in C++.
CVE-2019-3859
While investigating the impact of CVE-2019-13115 in Debian jessie's
version of libssh2, it was discovered that issues around
CVE-2019-3859 had not been fully resolved in Debian jessie's version
of libssh2. A thorough manual (read, analyze, and copy code changes
if needed) comparison of upstream code and code in Debian jessie's
version of libssh2 was done and various more boundary checks and
integer overflow protections got added to the package.
CVE-2019-13115
Kevin Backhouse from semmle.com discovered that initial fixes for the
CVE series CVE-2019-3855 - 2019-3863 introduced several regressions
about signedness of length return values into the upstream code.
While working on the CVE-2019-3859 update mentioned above, it was
paid attention to not introduce these upstream regression registered
as CVE-2019-13115.
For Debian 8 "Jessie", these problems have been fixed in version
1.4.3-4.1+deb8u4.
We recommend that you upgrade your libssh2 packages.
Further information about Debian LTS security advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://wiki.debian.org/LTS
- --
mike gabriel aka sunweaver (Debian Developer)
fon: +49 (1520) 1976 148
GnuPG Fingerprint: 9BFB AEE8 6C0A A5FF BF22 0782 9AF4 6B30 2577 1B31
mail: sunweaver@debian.org, http://sunweavers.net
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Package : libssh2
Version : 1.4.3-4.1+deb8u5
CVE ID : CVE-2019-3860
Several more boundary checks have been backported to libssh2's
src/sftp.c. Furthermore, all boundary checks in src/sftp.c now result in
an LIBSSH2_ERROR_BUFFER_TOO_SMALL error code, rather than a
LIBSSH2_ERROR_ OUT_OF_BOUNDARY error code.
As a side note, it was discovered that libssh2's SFTP implementation from
Debian jessie only works well against OpenSSH SFTP servers from Debian
wheezy, tests against newer OpenSSH versions (such as available in Debian
jessie and beyond) interim-fail with SFTP protocol error "Error opening
remote file". Operation might continue after this error, this depends on
application implementations.
For Debian 8 "Jessie", this problem has been fixed in version
1.4.3-4.1+deb8u5.
We recommend that you upgrade your libssh2 packages.
Further information about Debian LTS security advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://wiki.debian.org/LTS
- --
mike gabriel aka sunweaver (Debian Developer)
fon: +49 (1520) 1976 148
GnuPG Fingerprint: 9BFB AEE8 6C0A A5FF BF22 0782 9AF4 6B30 2577 1B31
mail: sunweaver@debian.org, http://sunweavers.net
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