Vulnerabilities > CVE-2021-20304 - Integer Overflow or Wraparound vulnerability in Openexr
Attack vector
NETWORK Attack complexity
LOW Privileges required
NONE Confidentiality impact
NONE Integrity impact
NONE Availability impact
HIGH Summary
A flaw was found in OpenEXR's hufDecode functionality. This flaw allows an attacker who can pass a crafted file to be processed by OpenEXR, to trigger an undefined right shift error. The highest threat from this vulnerability is to system availability.
Vulnerable Configurations
Common Weakness Enumeration (CWE)
Common Attack Pattern Enumeration and Classification (CAPEC)
- Forced Integer Overflow This attack forces an integer variable to go out of range. The integer variable is often used as an offset such as size of memory allocation or similarly. The attacker would typically control the value of such variable and try to get it out of range. For instance the integer in question is incremented past the maximum possible value, it may wrap to become a very small, or negative number, therefore providing a very incorrect value which can lead to unexpected behavior. At worst the attacker can execute arbitrary code.
References
- https://access.redhat.com/security/cve/CVE-2021-20304
- https://github.com/AcademySoftwareFoundation/openexr/pull/849
- https://github.com/AcademySoftwareFoundation/openexr/commit/51a92d67f53c08230734e74564c807043cbfe41e
- https://bugzilla.redhat.com/show_bug.cgi?id=1939157
- https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=26229
- https://security.gentoo.org/glsa/202210-31