Opened 19 years ago

Last modified 18 years ago

#839 closed bug

multiple utf-8 string vulnerabilities — at Version 1

Reported by: marcusoverhagen Owned by: axeld
Priority: normal Milestone: R1
Component: Kits/Interface Kit Version:
Keywords: Cc:
Blocked By: Blocking:
Platform: All

Description (last modified by marcusoverhagen)

Multiple UTF-8 functions are unsave and vulnerable to denial of service attacks or buffer overflow attacks.

This includes:

count_utf8_bytes

UTF8CountBytes

UTF8CountChars

UTF8ToCharCode

UTF8ToLength

It is dangerous to look only at the first byte to determine how long an character sequence is. A malformed sequence can be used to skip a string's terminating zero byte.

Example (2 bytes and terminating zero):

0xE0 0x81 0x00

The first byte tells that it's 3 bytes long, and the above mentioned functions will skip the terminating zero.

Change History (1)

comment:1 by marcusoverhagen, 19 years ago

Description: modified (diff)
Summary: mutlpile utf-8 string vulnerabilities → multiple utf-8 string vulnerabilities
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