openssl/openssl
Nov 2024 – Apr 2025
3 Months active
Languages Used
C
Technical Skills
Bug fixingC programmingSecurity vulnerability remediationBug FixC ProgrammingCryptography
Andrey Tsygunka
PROFILE
Andrey Tsygunka
Aitsygunka contributed to the openssl/openssl repository by focusing on security hardening and stability improvements in C, with an emphasis on cryptography and memory management. Over three months, they addressed critical bugs such as a heap buffer overflow in ASN.1 BIT STRING handling, NULL pointer dereferences, and memory leaks in the crypto subsystem. Their work involved careful analysis of edge cases, secure coding practices, and precise patch management to prevent memory corruption and crashes. By improving the robustness of encoding paths and TLS workflows, Aitsygunka enhanced the reliability and security of OpenSSL’s low-level cryptographic infrastructure through targeted, well-documented fixes.
Overall Statistics
Feature vs Bugs
0%Features
Repository Contributions
5Total
Bugs
3
Commits
5
Features
0
Lines of code
81
Activity Months3
Your Network
223 people
Work History
April 2025
2 Commits
Apr 1, 2025April 2025 - openssl/openssl: Crypto subsystem stability improvements focused on crash prevention and memory safety. Implemented two fixes with commits 28de1f5004c1083d358e6934552124a201e0251e and 11e1ea9d4d0c9a5e84b944535332aebf673e82f0 to address: (1) potential NULL pointer dereference in final_maxfragmentlen() by moving the NULL check for s->session to the function start; (2) memory leak in x509_pubkey_ex_d2i_ex() by ensuring a previously allocated string buffer isn't lost if ASN1_item_ex_d2i fails. These changes improve reliability of the crypto subsystem, reduce production risk, and enhance memory hygiene.
2 Commits
Apr 1, 2025April 2025 - openssl/openssl: Crypto subsystem stability improvements focused on crash prevention and memory safety. Implemented two fixes with commits 28de1f5004c1083d358e6934552124a201e0251e and 11e1ea9d4d0c9a5e84b944535332aebf673e82f0 to address: (1) potential NULL pointer dereference in final_maxfragmentlen() by moving the NULL check for s->session to the function start; (2) memory leak in x509_pubkey_ex_d2i_ex() by ensuring a previously allocated string buffer isn't lost if ASN1_item_ex_d2i fails. These changes improve reliability of the crypto subsystem, reduce production risk, and enhance memory hygiene.
April 2025
March 2025
2 Commits
Mar 1, 2025March 2025 monthly summary for openssl/openssl: Focused on hardening ASN.1 encoding paths and stream I/O. Delivered critical bug fixes addressing undefined ASN.1 values and i2d_bio stream behavior, reducing crash risk and improving encoding correctness. These changes strengthen stability for S/MIME workflows and other crypto-encoding use cases, with clear, well-documented commits.
March 2025
2 Commits
Mar 1, 2025March 2025 monthly summary for openssl/openssl: Focused on hardening ASN.1 encoding paths and stream I/O. Delivered critical bug fixes addressing undefined ASN.1 values and i2d_bio stream behavior, reducing crash risk and improving encoding correctness. These changes strengthen stability for S/MIME workflows and other crypto-encoding use cases, with clear, well-documented commits.
November 2024
1 Commits
Nov 1, 2024November 2024 monthly summary for openssl/openssl focusing on security hardening and stability. No new features were released this month. The primary accomplishment was a critical bug fix: a heap buffer overflow in ossl_i2c_ASN1_BIT_STRING when input data consists solely of zero values. The fix prevents potential memory corruption and security risk, delivered via commit bf2dea0e2c6f1cfe1a8222088052ebcc63ab1004 with message 'ossl_i2c_ASN1_BIT_STRING(): Fix a possible heap buffer overflow'. Impact includes improved robustness of ASN.1 BIT STRING handling and reduced risk across deployments. Technologies/skills demonstrated include C memory safety practices, secure coding, vulnerability remediation, patch management, code review and integration in OpenSSL.
1 Commits
Nov 1, 2024November 2024 monthly summary for openssl/openssl focusing on security hardening and stability. No new features were released this month. The primary accomplishment was a critical bug fix: a heap buffer overflow in ossl_i2c_ASN1_BIT_STRING when input data consists solely of zero values. The fix prevents potential memory corruption and security risk, delivered via commit bf2dea0e2c6f1cfe1a8222088052ebcc63ab1004 with message 'ossl_i2c_ASN1_BIT_STRING(): Fix a possible heap buffer overflow'. Impact includes improved robustness of ASN.1 BIT STRING handling and reduced risk across deployments. Technologies/skills demonstrated include C memory safety practices, secure coding, vulnerability remediation, patch management, code review and integration in OpenSSL.
November 2024
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Quality Metrics
Correctness100.0%
Maintainability100.0%
Architecture100.0%
Performance100.0%
AI Usage20.0%
Skills & Technologies
Programming Languages
C
Technical Skills
Bug FixBug FixingBug fixingC ProgrammingC programmingCryptographyLow-level programmingMemory ManagementSSL/TLSSecurity vulnerability remediation
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