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CVE-2013-4206

UnknownEPSS 2.48%

Last modified

CVE-2013-4206 is a vulnerability of currently unknown severity. 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.. EPSS estimates a 2.48% chance of exploitation in the next 30 days.

Description

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.

Metrics

EPSS Probability
2.48%

82.5th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

VendorProductVersionsUpdate
PuttyPutty0.45—
PuttyPutty0.46—
PuttyPutty0.47—
PuttyPutty0.48—
PuttyPutty0.49—
PuttyPutty0.50—
PuttyPutty0.51—
PuttyPutty0.52—
PuttyPutty0.53b—
PuttyPutty0.54—
PuttyPutty0.55—
PuttyPutty0.56—
PuttyPutty0.57—
PuttyPutty0.58—
PuttyPutty0.59—
PuttyPutty0.60—
PuttyPutty0.61—
PuttyPutty2010-06-01R8967
Simon TathamPutty<= 0.62—
Simon TathamPutty0.53—

References

Timeline

Published
Last Modified
Status
Modified

Frequently Asked Questions

What is 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.
How severe is CVE-2013-4206?
Severity scoring for CVE-2013-4206 is pending analysis. The EPSS model estimates a 2.48% probability of exploitation in the next 30 days.
How do I fix CVE-2013-4206?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2013-4206?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST