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ubuntuUbuntuUSN-127-1
HistoryMay 17, 2005 - 12:00 a.m.

bzip2 vulnerabilities

2005-05-1700:00:00
ubuntu.com
40

CVSS2

5

Attack Vector

NETWORK

Attack Complexity

LOW

Authentication

NONE

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

PARTIAL

AV:N/AC:L/Au:N/C:N/I:N/A:P

AI Score

6.2

Confidence

Low

EPSS

0.013

Percentile

86.1%

Releases

  • Ubuntu 5.04
  • Ubuntu 4.10

Details

Imran Ghory discovered a race condition in the file permission restore
code of bunzip2. While a user was decompressing a file, a local
attacker with write permissions in the directory of that file could
replace the target file with a hard link. This would cause bzip2 to
restore the file permissions to the hard link target instead of to the
bzip2 output file, which could be exploited to gain read or even write
access to files of other users. (CAN-2005-0953)

Specially crafted bzip2 archives caused an infinite loop in the
decompressor which resulted in an indefinitively large output file
(“decompression bomb”). This could be exploited to a Denial of Service
attack due to disk space exhaustion on systems which automatically
process user supplied bzip2 compressed files. (CAN-2005-1260)

CVSS2

5

Attack Vector

NETWORK

Attack Complexity

LOW

Authentication

NONE

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

PARTIAL

AV:N/AC:L/Au:N/C:N/I:N/A:P

AI Score

6.2

Confidence

Low

EPSS

0.013

Percentile

86.1%