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Bug #7961

Bug #7960: curl: FTP PWD response parser out of bounds read (CVE-2017-1000254)

[3.7] curl: FTP PWD response parser out of bounds read (CVE-2017-1000254)

Added by Alicha CH 10 months ago. Updated 10 months ago.

Status:
Closed
Priority:
Normal
Assignee:
Category:
Security
Target version:
Start date:
10/04/2017
Due date:
% Done:

100%

Estimated time:
Affected versions:

Description

When libcurl connects to an FTP server and successfully logs in (anonymous or not), it asks the server for the
current directory with the PWD command. The server then responds with a 257 response containing the path,
inside double quotes. The returned path name is then kept by libcurl for subsequent uses.

Due to a flaw in the string parser for this directory name, a directory name passed like this but without a closing
double quote would lead to libcurl not adding a trailing NUL byte to the buffer holding the name. When libcurl would
then later access the string, it could read beyond the allocated heap buffer and crash or wrongly access data
beyond the buffer, thinking it was part of the path.

Affected versions:

libcurl 7.7 to and including 7.55.1

Not affected versions:

libcurl < 7.7 and >= 7.56.0

References:

https://curl.haxx.se/docs/adv_20171004.html
http://openwall.com/lists/oss-security/2017/10/04/1

Patch:

https://curl.haxx.se/CVE-2017-1000254.patch

History

#1 Updated by Natanael Copa 10 months ago

  • Status changed from New to Resolved
  • % Done changed from 0 to 100

#2 Updated by Alicha CH 10 months ago

  • Category set to Security
  • Status changed from Resolved to Closed

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