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Out-of-bounds memory comparison

Project libssh2 Security Advisory, March 18 2019 - Permalink

VULNERABILITY

A server could send a specially crafted SSH_MSG_CHANNEL_REQUEST packet with an exit status message and no payload. This would result in an out of bounds memory comparison (CWE-130).

There are no known exploits of this flaw at this time.

INFO

The Common Vulnerabilities and Exposures (CVE) project has assigned the name CVE-2019-3862 to this issue.

AFFECTED VERSIONS

  • Affected versions: versions 0.11 up to and including 1.8.0
  • Not affected versions: libssh2 >= 1.8.1

THE SOLUTION

libssh2 1.8.1 ensures the length of the packet is greater or equal to the value being compared before calling memcmp().

A patch for this problem is available

RECOMMENDATIONS

We suggest you take one of the following actions immediately, in order of preference:

A - Upgrade to libssh2 1.8.1 or later

B - Apply the patch and rebuild libssh2

TIME LINE

It was first reported to the libssh2 project on Dec 3 2018 by Chris Coulson.

libssh2 1.8.1 was released on March 18 2019, coordinated with the publication of this advisory.

CREDITS

Reported by Chris Coulson of Canonical Ltd.