PT-2021-18261 · Microsoft · .Net Binaryformatter

Rogeralsing · Published 2021-05-11 · Updated 2021-05-25 · CVE-2021-29508

Positive Technologies (AI Summary)

CVSS v3.1

9.1

Critical

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H

Name of the Vulnerable Software and Affected Versions: Wire (affected versions not specified) Wire fork, AkkaDotNet/Hyperion (affected versions not specified)

Description: The issue arises from how Wire handles type information in its serialization format, allowing malicious payloads to be passed to a deserializer. An attacker can use a surrogate on the sender end to pass information about a different type for the receiving end, enabling the serializer to create any type on the deserializing end. This issue is similar to the one existing for .NET BinaryFormatter.

Recommendations: For Wire, consider disabling the deserialization of untrusted data until a patch is available. For Wire fork, AkkaDotNet/Hyperion, restrict the use of the serialization format to trusted sources to minimize the risk of exploitation. At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Exploit

Deserialization of Untrusted Data

Weakness Enumeration

CWE-502

Related Identifiers

CVE-2021-29508

GHSA-HPW7-3VQ3-MMV6

Affected Products

.Net Binaryformatter

References · 4

• 🔥 https://github.com/AsynkronIT/Wire/security/advisories/GHSA-hpw7-3vq3-mmv6 · Exploit
• https://nvd.nist.gov/vuln/detail/CVE-2021-29508 · Security Note
• https://osv.dev/vulnerability/GHSA-hpw7-3vq3-mmv6 · Vendor Advisory
• https://nuget.org/packages/Wire · Note