SB2015060103 - Path traversal in Moodle

Description

This security bulletin contains information about 1 vulnerability.

1) Path traversal (CVE-ID: CVE-2015-1493)

CWE-ID: CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Green

The vulnerability allows a remote user to perform directory traversal attacks.

The vulnerability exists due to input validation error when processing directory traversal sequences in the min_get_slash_argument function in lib/configonlylib.php in Moodle through 2.5.9, 2.6.x before 2.6.8, 2.7.x before 2.7.5, and 2.8.x before 2.8.3. A remote authenticated user can send a specially crafted HTTP request and remote authenticated users to read arbitrary files via a . (dot dot) in the file parameter, as demonstrated by reading PHP scripts.

Remediation

Install update from vendor's website.

References

• http://git.moodle.org/gw?p=moodle.git&a=search&h=HEAD&st=commit&s=MDL-48980
• http://git.moodle.org/gw?p=moodle.git;a=commit;h=af9a7937cc085f96bdbc4724cadec6eeae0242fc
• http://openwall.com/lists/oss-security/2015/02/04/15
• http://openwall.com/lists/oss-security/2015/02/09/2
• https://moodle.org/mod/forum/discuss.php?d=279956