cygwin up to 1.8.0 wcsxfrm/wcsxfrm_l memory corruption

Summaryinfo

A vulnerability categorized as critical has been discovered in cygwin up to 1.8.0. Affected is the function wcsxfrm/wcsxfrm_l. Such manipulation leads to memory corruption. This vulnerability is listed as CVE-2017-7523. The attack may be performed from remote. There is no available exploit.

Detailsinfo

A vulnerability was found in cygwin up to 1.8.0 and classified as critical. Affected by this issue is the function wcsxfrm/wcsxfrm_l. 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:

Cygwin versions 1.7.2 up to and including 1.8.0 are vulnerable to buffer overflow vulnerability in wcsxfrm/wcsxfrm_l functions resulting into denial-of-service by crashing the process or potential hijack of the process running with administrative privileges triggered by specially crafted input string.

The bug was discovered 05/10/2017. The weakness was presented 07/21/2017 (Website). The advisory is available at cygwin.com. This vulnerability is handled as CVE-2017-7523 since 04/05/2017. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. Technical details are known, but there is no available exploit.

The vulnerability was handled as a non-public zero-day exploit for at least 72 days. During that time the estimated underground price was around $0-$5k.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Name

• cygwin

Version

• 1.0
• 1.1
• 1.2
• 1.3
• 1.4
• 1.5
• 1.6
• 1.7
• 1.8.0

CPE 2.3info

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CPE 2.2info

• 🔍
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If you want to get best quality of vulnerability data, you may have to visit VulDB.

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