SB2015112807 - Input validation error in libxml2 (Alpine package)

Description

This security bulletin contains information about 1 security vulnerability.

1) Input validation error (CVE-ID: CVE-2015-7941)

The vulnerability allows context-dependent attackers to perform a denial of service (DoS) attack.

The vulnerability exists due to insufficient validation of user-supplied input. A remote attacker can cause a denial of service (out-of-bounds read and libxml2 crash) via crafted XML data to the (1) xmlParseEntityDecl or (2) xmlParseConditionalSections function in parser.c, as demonstrated by non-terminated entities. "context dependent" seems to point to MiTM attack due to: If a user or automated system were tricked into opening a specially crafted document, an attacker could possibly cause libxml2 to crash, resulting in a denial of service.

Remediation

Install update from vendor's website.

References

• https://git.alpinelinux.org/aports/commit/?id=0215e6588cf7cdc9ec3c57926af82e79b8366e46
• https://git.alpinelinux.org/aports/commit/?id=9e3ec8396214f0ec09a2b5c75e65bbc808013c84
• https://git.alpinelinux.org/aports/commit/?id=f084c470893c32a5ab1b765dfe1fa044af19320d
• https://git.alpinelinux.org/aports/commit/?id=d43279c37e7c6a85eb14e2879d00bb7d74e9aa45