CVE Vulnerabilities

CVE-2023-0795

Out-of-bounds Read

Published: Feb 13, 2023 | Modified: May 30, 2023
CVSS 3.x
5.5
MEDIUM
Source:
NVD
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
CVSS 2.x
RedHat/V2
RedHat/V3
6.1 MODERATE
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H
Ubuntu
MEDIUM

LibTIFF 4.4.0 has an out-of-bounds read in tiffcrop in tools/tiffcrop.c:3488, allowing attackers to cause a denial-of-service via a crafted tiff file. For users that compile libtiff from sources, the fix is available with commit afaabc3e.

Weakness

The product reads data past the end, or before the beginning, of the intended buffer.

Affected Software

Name Vendor Start Version End Version
Libtiff Libtiff * 4.4.0 (including)
Red Hat Enterprise Linux 9 RedHat libtiff-0:4.4.0-8.el9_2 *
Tiff Ubuntu bionic *
Tiff Ubuntu esm-infra/bionic *
Tiff Ubuntu esm-infra/xenial *
Tiff Ubuntu focal *
Tiff Ubuntu jammy *
Tiff Ubuntu kinetic *
Tiff Ubuntu trusty *
Tiff Ubuntu trusty/esm *
Tiff Ubuntu upstream *
Tiff Ubuntu xenial *

Potential Mitigations

  • Assume all input is malicious. Use an “accept known good” input validation strategy, i.e., use a list of acceptable inputs that strictly conform to specifications. Reject any input that does not strictly conform to specifications, or transform it into something that does.
  • When performing input validation, consider all potentially relevant properties, including length, type of input, the full range of acceptable values, missing or extra inputs, syntax, consistency across related fields, and conformance to business rules. As an example of business rule logic, “boat” may be syntactically valid because it only contains alphanumeric characters, but it is not valid if the input is only expected to contain colors such as “red” or “blue.”
  • Do not rely exclusively on looking for malicious or malformed inputs. This is likely to miss at least one undesirable input, especially if the code’s environment changes. This can give attackers enough room to bypass the intended validation. However, denylists can be useful for detecting potential attacks or determining which inputs are so malformed that they should be rejected outright.
  • To reduce the likelihood of introducing an out-of-bounds read, ensure that you validate and ensure correct calculations for any length argument, buffer size calculation, or offset. Be especially careful of relying on a sentinel (i.e. special character such as NUL) in untrusted inputs.

References