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7.2	$0-$5k	0.00

Summaryinfo

A vulnerability described as problematic has been identified in Python 2.6.8/2.7.5/3.3.2. Impacted is the function readline of the component ftplib. Executing a manipulation can lead to memory allocation. This vulnerability is tracked as CVE-2013-1752. No exploit exists. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability has been found in Python 2.6.8/2.7.5/3.3.2 (Programming Language Software) and classified as critical. This vulnerability affects the function readline of the component ftplib. The manipulation with an unknown input leads to a memory allocation vulnerability. The CWE definition for the vulnerability is CWE-789. The product allocates memory based on an untrusted, large size value, but it does not ensure that the size is within expected limits, allowing arbitrary amounts of memory to be allocated. As an impact it is known to affect availability.

The weakness was disclosed 09/25/2012 by Christian Heimes with OUSPG as Issue16037 as confirmed bug report (Website). The advisory is shared for download at bugs.python.org. This vulnerability was named CVE-2013-1752 since 02/15/2013. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. There are known technical details, but no exploit is available. The advisory points out:

The httplib module / package can read arbitrary amounts of data from its socket when it's parsing the HTTP header. This may lead to issues when a user connects to a broken HTTP server or something that isn't a HTTP at all. The issue can be broken up into two parts: parsing the HTTP status line parsing and parsing the remaining HTTP headers.

The vulnerability scanner Nessus provides a plugin with the ID 75315 (openSUSE Security Update : python3 (openSUSE-SU-2014:0498-1)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family SuSE Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 350081 (Amazon Linux Security Advisory for python26: ALAS-2015-621).

Upgrading to version 2.7.6, 2.6.9 or 3.3.3 eliminates this vulnerability. The upgrade is hosted for download at hg.python.org. A possible mitigation has been published 5 months after the disclosure of the vulnerability. The vulnerability will be addressed with the following lines of code:

--- a/Lib/httplib.py
+++ b/Lib/httplib.py
@@ -362,7 +362,9 @@

     def _read_status(self):
         # Initialize with Simple-Response defaults
-        line = self.fp.readline()
+        line = self.fp.readline(_MAXLINE + 1)
+        if len(line) > _MAXLINE:
+            raise LineTooLong("header line")
         if self.debuglevel > 0:
             print "reply:", repr(line)
         if not line:

The bug report contains the following remark:

Reading and parsing of the HTTP status line is already limited in Python 3.x. Python 2.7 and lower may read arbitrary amounts of bytes from the socket until it finds a newline char. (…) Both Python 2 and Python 3 accept an unlimited count of HTTP headers with a maximum length of 64k each. As headers are accumulated in an list it may consume lots of memory. I suggest that we limit the maximum amount of HTTP header lines to a sane value. How does 100 sound to you?

The vulnerability is also documented in the databases at Tenable (75315), SecurityFocus (BID 61050†), OSVDB (101385†) and Secunia (SA56226†). The entries VDB-11628, VDB-11629, VDB-11630 and VDB-11631 are pretty similar. Once again VulDB remains the best source for vulnerability data.

Productinfo

Type

• Programming Language Software

Name

• Python

Version

• 2.6.8
• 2.7.5
• 3.3.2

License

• open-source

CPE 2.3info

• 🔍
• 🔍
• 🔍

CPE 2.2info

• 🔍
• 🔍
• 🔍

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.5
VulDB Meta Temp Score: 7.2

VulDB Base Score: 7.5
VulDB Temp Score: 7.2
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

AV	AC	Au	C	I	A
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳

Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock

VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

Exploitinginfo

Class: Memory allocation
CWE: CWE-789 / CWE-400 / CWE-404
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined
Price Prediction: 🔍
Current Price Estimation: 🔍

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Nessus ID: 75315
Nessus Name: openSUSE Security Update : python3 (openSUSE-SU-2014:0498-1)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍
Nessus Port: 🔍

OpenVAS ID: 65811
OpenVAS Name: VMSA-2014-0012: VMware vSphere product updates address security vulnerabilities
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

Reaction Time: 🔍
0-Day Time: 🔍
Exposure Time: 🔍

Upgrade: Python 2.7.6/2.6.9/3.3.3

Timelineinfo

09/25/2012 🔍
02/05/2013 +133 days 🔍
02/15/2013 +10 days 🔍
07/09/2013 +144 days 🔍
12/27/2013 +171 days 🔍
12/27/2013 +0 days 🔍
06/13/2014 +168 days 🔍
04/29/2019 +1781 days 🔍

Sourcesinfo

Advisory: Issue16037
Researcher: Christian Heimes
Organization: OUSPG
Status: Confirmed

CVE: CVE-2013-1752 (🔍)
GCVE (CVE): GCVE-0-2013-1752
GCVE (VulDB): GCVE-100-11632

OVAL: 🔍

SecurityFocus: 61050 - Google Chrome CVE-2013-2877 Out of Bounds Denial of Service Vulnerability
Secunia: 56226 - Python Multiple Vulnerabilities, Less Critical
OSVDB: 101385

See also: 🔍

Entryinfo

Created: 12/27/2013 23:34
Updated: 04/29/2019 16:12
Changes: 12/27/2013 23:34 (77), 04/29/2019 16:12 (1)
Complete: 🔍
Cache ID: 216:2E5:103

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