Vulnerabilities
Misconfiguration
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CVE Vulnerabilities

CVE-2019-3857

Integer Overflow or Wraparound

Published: Mar 25, 2019 | Modified: Nov 07, 2023
CVSS 3.x
8.8
HIGH
Source:
NVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
CVSS 2.x
6.8 MEDIUM
AV:N/AC:M/Au:N/C:P/I:P/A:P
RedHat/V2
RedHat/V3
7.5 IMPORTANT
CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
Ubuntu
MEDIUM
Additional information
NVDhttps://nvd.nist.gov/vuln/detail/CVE-2019-3857
CWEhttps://cwe.mitre.org/data/definitions/190.html

An integer overflow flaw which could lead to an out of bounds write was discovered in libssh2 before 1.8.1 in the way SSH_MSG_CHANNEL_REQUEST packets with an exit signal are parsed. 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.

Weakness

The product performs a calculation that can produce an integer overflow or wraparound, when the logic assumes that the resulting value will always be larger than the original value. This can introduce other weaknesses when the calculation is used for resource management or execution control.

Affected Software

Name Vendor Start Version End Version
Libssh2 Libssh2 1.2.8 (including) 1.8.0 (including)
Red Hat Enterprise Linux 6 RedHat libssh2-0:1.4.2-3.el6_10.1 *
Red Hat Enterprise Linux 7 RedHat libssh2-0:1.4.3-12.el7_6.2 *
Red Hat Enterprise Linux 7.3 Advanced Update Support RedHat libssh2-0:1.4.3-11.el7_3.1 *
Red Hat Enterprise Linux 7.3 Telco Extended Update Support RedHat libssh2-0:1.4.3-11.el7_3.1 *
Red Hat Enterprise Linux 7.3 Update Services for SAP Solutions RedHat libssh2-0:1.4.3-11.el7_3.1 *
Red Hat Enterprise Linux 7.4 Extended Update Support RedHat libssh2-0:1.4.3-11.el7_4.1 *
Red Hat Enterprise Linux 7.5 Extended Update Support RedHat libssh2-0:1.4.3-11.el7_5.1 *
Red Hat Enterprise Linux 8 RedHat virt:rhel-8000020190510171727.55190bc5 *
Libssh2 Ubuntu bionic *
Libssh2 Ubuntu cosmic *
Libssh2 Ubuntu esm-apps/bionic *
Libssh2 Ubuntu esm-apps/xenial *
Libssh2 Ubuntu trusty *
Libssh2 Ubuntu trusty/esm *
Libssh2 Ubuntu xenial *

Potential Mitigations

  • Use a language that does not allow this weakness to occur or provides constructs that make this weakness easier to avoid.
  • If possible, choose a language or compiler that performs automatic bounds checking.
  • Use a vetted library or framework that does not allow this weakness to occur or provides constructs that make this weakness easier to avoid.
  • Use libraries or frameworks that make it easier to handle numbers without unexpected consequences.
  • Examples include safe integer handling packages such as SafeInt (C++) or IntegerLib (C or C++). [REF-106]
  • Perform input validation on any numeric input by ensuring that it is within the expected range. Enforce that the input meets both the minimum and maximum requirements for the expected range.
  • Use unsigned integers where possible. This makes it easier to perform validation for integer overflows. When signed integers are required, ensure that the range check includes minimum values as well as maximum values.
  • Understand the programming language’s underlying representation and how it interacts with numeric calculation (CWE-681). Pay close attention to byte size discrepancies, precision, signed/unsigned distinctions, truncation, conversion and casting between types, “not-a-number” calculations, and how the language handles numbers that are too large or too small for its underlying representation. [REF-7]
  • Also be careful to account for 32-bit, 64-bit, and other potential differences that may affect the numeric representation.

References

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