ASA-2019-00146 – libssh2: Possible zero-byte allocation leading to an out-of-bounds read

Posted on by Allele Security Intelligence in Alerts

Allele Security Alert

ASA-2019-00146

Identifier(s)

ASA-2019-00146, CVE-2019-3858

Title

Possible zero-byte allocation leading to an out-of-bounds read

Vendor(s)

The libssh2 project

Product(s)

libssh2

Affected version(s)

libssh2 versions 0.3 up to and including 1.8.0

Fixed version(s)

libssh2 1.8.1

Proof of concept

Unknown

Description

A server could send a specially crafted partial SFTP packet with a zero value for the payload length. This zero value would be used to then allocate memory resulting in a zero byte allocation and possible out of bounds read (CWE-130).

Technical details

Unknown

Credits

Chris Coulson (Canonical Ltd)

Reference(s)

libssh2 Security Advisory: CVE-2019-3858
https://www.libssh2.org/CVE-2019-3858.html

[SECURITY ADVISORIES] libssh2
https://seclists.org/oss-sec/2019/q1/184

Security fixes (#315) · libssh2/libssh2@dc109a7
https://github.com/libssh2/libssh2/commit/dc109a7f518757741590bb993c0c8412928ccec2

Security fixes by willco007 · Pull Request #315 · libssh2/libssh2
https://github.com/libssh2/libssh2/pull/315

CVE-2019-3858 - Red Hat Customer Portal
https://access.redhat.com/security/cve/CVE-2019-3858

CVE-2019-3858
https://security-tracker.debian.org/tracker/CVE-2019-3858

CVE-2019-3858 in Ubuntu
https://people.canonical.com/~ubuntu-security/cve/CVE-2019-3858.html

CVE-2019-3858 | SUSE
https://www.suse.com/security/cve/CVE-2019-3858

CVE-2019-3858
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-3858

CVE-2019-3858
https://nvd.nist.gov/vuln/detail/CVE-2019-3858

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Last modified: March 19, 2019

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