Exim up to 3.14 string.c string_vformat memory corruption

CVSS Meta Temp Score
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CTI Interest Score
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9.5$0-$5k0.00

A vulnerability was found in Exim up to 3.14 (Mail Server Software) and classified as very critical. Affected by this issue is the function string_vformat of the file string.c. The manipulation with an unknown input leads to a memory corruption vulnerability. Using CWE to declare the problem leads to CWE-119. The product performs operations on a memory buffer, but it can read from or write to a memory location that is outside of the intended boundary of the buffer. Impacted is confidentiality, integrity, and availability. CVE summarizes:

Heap-based buffer overflow in the string_vformat function in string.c in Exim before 4.70 allows remote attackers to execute arbitrary code via an SMTP session that includes two MAIL commands in conjunction with a large message containing crafted headers, leading to improper rejection logging.

The bug was discovered 12/07/2010. The weakness was shared 12/07/2010 as confirmed advisory (CERT.org). The advisory is shared for download at kb.cert.org. This vulnerability is handled as CVE-2010-4344 since 11/30/2010. The attack may be launched remotely. No form of authentication is required for exploitation. Technical details as well as a public exploit are known. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 04/24/2024).

A public exploit has been developed in Ruby and been published 3 days after the advisory. The exploit is available at securityfocus.com. It is declared as highly functional. The vulnerability scanner Nessus provides a plugin with the ID 68160 (Oracle Linux 4 / 5 : exim (ELSA-2010-0970)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Oracle Linux Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 118827 (Red Hat Update for Exim (RHSA-2010:0970)). This issue was added on 03/25/2022 to the CISA Known Exploited Vulnerabilities Catalog with a due date of 04/15/2022:

Apply updates per vendor instructions.

Upgrading to version 3.15 eliminates this vulnerability. A possible mitigation has been published 2 days after the disclosure of the vulnerability. Furthermore it is possible to detect and prevent this kind of attack with TippingPoint and the filter 10824.

The vulnerability is also documented in the vulnerability database at Tenable (68160). The entry 55725 is related to this item.

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CPE 2.3info

CPE 2.2info

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CVSSv3info

VulDB Meta Base Score: 10.0
VulDB Meta Temp Score: 9.5

VulDB Base Score: 10.0
VulDB Temp Score: 9.5
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Exploitinginfo

Class: Memory corruption
CWE: CWE-119
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Local: No
Remote: Yes

Availability: 🔍
Access: Public
Status: Highly functional
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Nessus ID: 68160
Nessus Name: Oracle Linux 4 / 5 : exim (ELSA-2010-0970)
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OpenVAS ID: 880458
OpenVAS Name: CentOS Update for exim CESA-2010:0970 centos4 i386
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MetaSploit ID: exim4_string_format.rb
MetaSploit Name: Exim4 string_format Function Heap Buffer Overflow
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Threat Intelligenceinfo

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Countermeasuresinfo

Recommended: Upgrade
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Upgrade: Exim 3.15
Patch: git.exim.org
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Timelineinfo

11/30/2010 🔍
12/07/2010 +7 days 🔍
12/07/2010 +0 days 🔍
12/07/2010 +0 days 🔍
12/07/2010 +0 days 🔍
12/09/2010 +2 days 🔍
12/10/2010 +1 days 🔍
12/10/2010 +0 days 🔍
12/10/2010 +0 days 🔍
12/14/2010 +3 days 🔍
12/14/2010 +0 days 🔍
07/12/2013 +941 days 🔍
03/19/2015 +615 days 🔍
04/24/2024 +3324 days 🔍

Sourcesinfo

Advisory: RHSA-2010:0970
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2010-4344 (🔍)
OVAL: 🔍

SecurityTracker: 1024858
Vulnerability Center: 28629 - University of Cambridge Remote Arbitrary Code Execution Vulnerability, High
SecurityFocus: 45308 - Exim Crafted Header Remote Code Execution Vulnerability
Secunia: 40019
OSVDB: 69685 - Exim string_format Function Remote Overflow
Vupen: ADV-2010-3171

scip Labs: https://www.scip.ch/en/?labs.20161013
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Entryinfo

Created: 03/19/2015 23:27
Updated: 04/24/2024 08:18
Changes: 03/19/2015 23:27 (90), 07/30/2019 12:14 (16), 10/06/2021 19:57 (3), 10/06/2021 20:04 (1), 10/06/2021 20:12 (1), 04/24/2024 08:18 (23)
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