A vulnerability in the manifest-parsing C code of Mercurial could allow a local attacker to cause an out-of-bounds read condition on a targeted system.
The vulnerability exists in the cext/manifest.c file of the affected software and is due to improper parsing of manifest entries. An attacker could exploit this vulnerability by sending a manifest entry that submits malicious input to the targeted system. An exploit could trigger an out-of-bounds read condition that the attacker could use to access sensitive information or cause a denial of service (DoS) condition.
Mercurial has confirmed the vulnerability and released software updates.
To exploit this vulnerability, the attacker must have user-level access to the targeted system. This access requirement may reduce the likelihood of a successful exploit.
Administrators are advised to apply the appropriate updates.
Administrators are advised to allow only trusted users to access local systems.
Administrators are advised to allow only privileged users to access administration or management systems.
Administrators are advised to monitor critical systems.
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Cisco Multivendor Vulnerability Alerts respond to vulnerabilities identified in third-party vendors' products. These alerts contain information compiled from diverse sources and provide comprehensive technical descriptions, objective analytical assessments, workarounds and practical safeguards, and links to vendor advisories and patches.