Vulnerability Monitor

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CVE-2013-4206


Heap-based buffer underflow in the modmul function in sshbn.c in PuTTY before 0.63 allows remote SSH servers to cause a denial of service (crash) and possibly trigger memory corruption or code execution via a crafted DSA signature, which is not properly handled when performing certain bit-shifting operations during modular multiplication.


Published

2013-08-19T23:55:08.723

Last Modified

2025-04-11T00:51:21.963

Status

Deferred

Source

[email protected]

Severity

CVSSv2: 6.8 (MEDIUM)

CVSSv2 Vector

AV:N/AC:M/Au:N/C:P/I:P/A:P

  • Access Vector: NETWORK
  • Access Complexity: MEDIUM
  • Authentication: NONE
  • Confidentiality Impact: PARTIAL
  • Integrity Impact: PARTIAL
  • Availability Impact: PARTIAL
Exploitability Score

8.6

Impact Score

6.4

Weaknesses
  • Type: Primary
    CWE-119

Affected Vendors & Products
Type Vendor Product Version/Range Vulnerable?
Application putty putty 0.45 Yes
Application putty putty 0.46 Yes
Application putty putty 0.47 Yes
Application putty putty 0.48 Yes
Application putty putty 0.49 Yes
Application putty putty 0.50 Yes
Application putty putty 0.51 Yes
Application putty putty 0.52 Yes
Application putty putty 0.53b Yes
Application putty putty 0.54 Yes
Application putty putty 0.55 Yes
Application putty putty 0.56 Yes
Application putty putty 0.57 Yes
Application putty putty 0.58 Yes
Application putty putty 0.59 Yes
Application putty putty 0.60 Yes
Application putty putty 0.61 Yes
Application putty putty 2010-06-01 Yes
Application simon_tatham putty ≤ 0.62 Yes
Application simon_tatham putty 0.53 Yes

References