Bug 2275061 (CVE-2024-3096)

Summary: CVE-2024-3096 php: password_verify can erroneously return true, opening ATO risk
Product: [Other] Security Response Reporter: ybuenos
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
Status: NEW --- QA Contact:
Severity: low Docs Contact:
Priority: low    
Version: unspecifiedKeywords: Security
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Hardware: All   
OS: Linux   
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Fixed In Version: php 8.1.28, php 8.2.18, php 8.3.6 Doc Type: ---
Doc Text:
A null byte interaction error vulnerability was found in PHP. If a password stored with password_hash starts with a null byte (\x00), testing a blank string as the password via password_verify will incorrectly return true. If a user can create a password with a leading null byte (unlikely, but syntactically valid), an attacker could trivially compromise the victim's account by attempting to sign in with a blank string.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Bug Depends On: 2275062    
Bug Blocks: 2275070    

Description ybuenos 2024-04-15 07:54:51 UTC 
If a password stored with password_hash starts with a null byte (\x00), testing a blank string as the password via password_verify will incorrectly return true.

If a user were able to create a password with a leading null byte (unlikely, but syntactically valid), an attacker could trivially compromise the victim's account by attempting to sign in with a blank string.
Comment 1 ybuenos 2024-04-15 07:55:06 UTC 
Created php tracking bugs for this issue:

Affects: fedora-all [bug 2275062]